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Biological databases are essential repositories for storing and organizing vast amounts of biological information. These digital archives play a crucial role in bioinformatics by enabling data-driven research and analysis across various life science disciplines.

Data retrieval and submission methods are fundamental to accessing and contributing to these databases. From web-based interfaces to programmatic APIs, researchers have multiple tools to extract specific information and submit new findings, ensuring the continuous growth and relevance of biological databases.

Biological databases overview

  • Biological databases serve as digital repositories for storing, organizing, and retrieving vast amounts of biological information
  • These databases play a crucial role in bioinformatics by facilitating data-driven research, analysis, and discovery in various life science disciplines

Types of biological databases

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  • Nucleotide sequence databases store DNA and RNA sequences (, , )
  • Protein sequence databases contain amino acid sequences and functional annotations (, PIR)
  • Structural databases house three-dimensional protein and nucleic acid structures (, )
  • Pathway databases organize information on biochemical reactions and signaling networks (, )
  • Taxonomic databases classify and organize biological species (, )

Primary vs secondary databases

  • Primary databases contain experimentally derived data submitted directly by researchers
    • Include raw sequence data, experimental results, and direct observations
    • Examples include GenBank, EMBL, and DDBJ for nucleotide sequences
  • Secondary databases curate and analyze data from primary sources
    • Provide value-added information through annotation, classification, and integration
    • Examples include UniProtKB/Swiss-Prot for curated protein information and Pfam for protein family classifications
  • Tertiary databases integrate information from multiple primary and secondary sources
    • Offer comprehensive views of biological systems and relationships
    • Examples include NCBI's and the Ensembl genome browser

Public vs proprietary databases

  • Public databases provide free access to data for academic and non-commercial use
    • Funded by government agencies, research institutions, or non-profit organizations
    • Examples include NCBI's databases, EBI resources, and PDB
  • Proprietary databases are owned and maintained by private companies or organizations
    • Require paid subscriptions or licenses for access
    • Often contain specialized or value-added data not available in public databases
    • Examples include by LifeMap Sciences and by BIOBASE

Data retrieval methods

  • Data retrieval in bioinformatics involves extracting specific information from biological databases
  • Efficient retrieval methods are essential for accessing and analyzing large-scale biological data sets

Database search interfaces

  • Web-based interfaces provide user-friendly access to databases through forms and menus
    • Allow users to input search terms, apply filters, and browse results
    • Examples include NCBI's Entrez system and UniProt's website
  • Command-line interfaces offer more powerful and flexible search capabilities
    • Enable advanced users to construct complex queries and automate searches
    • Examples include NCBI's and EBI's
  • Graphical user interfaces (GUIs) combine visual elements with search functionality
    • Facilitate data exploration and visualization
    • Examples include genome browsers () and pathway viewers ()

Query language basics

  • Boolean operators (AND, OR, NOT) combine search terms to refine results
  • Wildcards (*) and regular expressions allow for flexible pattern matching
  • Field-specific searches target particular data attributes (gene name, organism, publication date)
  • Proximity operators specify the distance between search terms in text-based searches
  • Range queries enable searches within specific numeric or date ranges

Sequence-based searches

  • (Basic Local Alignment Search Tool) compares query sequences against databases
    • Identifies similar sequences based on local alignments
    • Variants include nucleotide BLAST (blastn) and protein BLAST (blastp)
  • algorithm performs rapid sequence similarity searches
    • Uses a word-based approach to identify potential matches
  • Profile-based searches (, ) detect remote homologs
    • Utilize position-specific scoring matrices or hidden Markov models

Text-based searches

  • Keyword searches find exact matches or partial matches in text fields
  • Phrase searches look for specific combinations of words in a particular order
  • Semantic searches utilize natural language processing to understand query intent
  • Citation searches find articles that cite or are cited by a specific publication
  • Author searches retrieve publications by a particular researcher or group

Database submission process

  • The database submission process ensures that new biological data is accurately recorded and made accessible to the scientific community
  • Proper submission practices are crucial for maintaining data quality and integrity in bioinformatics resources

Data preparation guidelines

  • Standardize data formats according to database-specific requirements
    • Ensure consistency in file types, field names, and data structures
  • Validate data accuracy and completeness before submission
    • Check for errors, inconsistencies, or missing information
  • Organize metadata to provide context and experimental details
    • Include information on methods, conditions, and sample characteristics
  • Use controlled vocabularies and ontologies for consistent terminology
    • Apply standardized terms from resources like or MeSH
  • Prepare supporting documentation and supplementary files
    • Include protocols, raw data, or additional analyses as needed

Submission formats

  • FASTA format for nucleotide and protein sequences
    • Simple text-based format with a description line followed by the sequence
  • GenBank flat file format for annotated sequences
    • Includes sequence data, feature annotations, and bibliographic information
  • BED (Browser Extensible Data) format for genomic features
    • Tab-delimited text file specifying chromosome, start, and end positions
  • (Variant Call Format) for genetic variation data
    • Describes single nucleotide polymorphisms and structural variants
  • (eXtensible Markup Language) for structured data submission
    • Allows for hierarchical organization of complex biological information

Quality control measures

  • Automated validation tools check for format compliance and data integrity
    • Examples include NCBI's Sequin and EBI's Webin validation services
  • Manual curation by database staff ensures accuracy and consistency
    • Experts review submissions and may request additional information or clarification
  • Cross-referencing with existing data identifies potential conflicts or redundancies
    • Helps maintain data coherence across multiple databases
  • Version control systems track changes and updates to submitted data
    • Allow for correction of errors and addition of new information over time
  • Peer review process for certain databases (UniProtKB/Swiss-Prot) enhances data quality
    • Expert curators evaluate and annotate submissions before public release

Sequence data retrieval

  • Sequence data retrieval involves accessing and downloading nucleotide or protein sequences from specialized databases
  • These databases are essential for various bioinformatics analyses, including , phylogenetics, and functional prediction

GenBank and NCBI

  • GenBank serves as the primary nucleotide sequence database maintained by NCBI
    • Contains DNA and RNA sequences from various organisms
    • Provides annotated records with feature information and references
  • NCBI Entrez system integrates GenBank with other NCBI databases
    • Allows for cross-database searches and data retrieval
  • Sequence retrieval tools include web interfaces, command-line utilities, and APIs
    • Web BLAST for similarity searches
    • E-utilities for programmatic access to NCBI databases
  • GenBank file format includes detailed sequence annotations and metadata
    • Flat file format with structured fields for easy parsing

EMBL and EBI

  • European Nucleotide Archive (ENA) maintained by EMBL-EBI stores nucleotide sequences
    • Collaborates with GenBank and DDBJ in the International Nucleotide Sequence Database Collaboration (INSDC)
  • EBI provides web-based tools for sequence retrieval and analysis
    • Ensembl genome browser for vertebrate genomes
    • InterPro for protein sequence analysis and classification
  • RESTful APIs enable programmatic access to EBI resources
    • Allows for custom queries and batch data retrieval
  • EMBL flat file format used for sequence data storage and exchange
    • Similar to GenBank format but with some differences in structure and annotation

DDBJ and NIG

  • DNA Data Bank of Japan (DDBJ) is the third major nucleotide sequence database
    • Operated by the National Institute of Genetics (NIG) in Japan
    • Participates in daily data exchange with GenBank and EMBL
  • DDBJ provides web-based tools for sequence submission and retrieval
    • ARSA (All-round Retrieval of Sequence and Annotation) for integrated searches
    • getentry for retrieving specific entries by accession number
  • Programmatic access available through Web API services
    • Supports REST and SOAP protocols for data retrieval
  • DDBJ flat file format compatible with GenBank and EMBL formats
    • Ensures seamless data exchange between INSDC partners

Protein data retrieval

  • Protein data retrieval involves accessing information about protein sequences, structures, and functions from specialized databases
  • These resources are crucial for understanding protein biology, evolution, and interactions in bioinformatics research

UniProtKB/Swiss-Prot

  • UniProtKB (UniProt Knowledgebase) serves as a comprehensive protein sequence and functional information resource
    • Swiss-Prot contains manually annotated and reviewed protein entries
    • TrEMBL (Translated EMBL) includes computationally annotated entries
  • Retrieval methods include web-based searches, downloadable datasets, and programmatic access
    • Advanced search options allow for complex queries based on various criteria
    • SPARQL endpoint enables semantic web queries
  • UniProtKB entries provide detailed protein information
    • Amino acid sequences, functional annotations, and cross-references to other databases
    • Gene terms for describing molecular functions, biological processes, and cellular components
  • Programmatic access through REST API and FTP downloads
    • Facilitates large-scale data analysis and integration

PDB and structural data

  • Protein Data Bank (PDB) archives three-dimensional structural data of biological macromolecules
    • Contains protein structures, nucleic acids, and complex assemblies
    • Determined by experimental methods (X-ray crystallography, NMR spectroscopy, cryo-EM)
  • Web-based tools for structure visualization and analysis
    • JSmol for interactive 3D structure viewing
    • PDBsum for structural summaries and diagrams
  • Data retrieval options include web interface, FTP downloads, and RESTful web services
    • Search by PDB ID, molecule name, or experimental method
    • Advanced search for specific structural features or ligands
  • PDB file format contains atomic coordinates and experimental details
    • mmCIF (macromolecular Crystallographic Information File) format for larger structures

Protein family databases

  • Pfam database classifies proteins into families based on conserved domains
    • Uses hidden Markov models (HMMs) to identify protein domains
    • Provides information on domain architecture and evolutionary relationships
  • InterPro integrates multiple protein signature databases
    • Combines resources like Pfam, PROSITE, and SMART
    • Offers a unified view of protein domains and functional sites
  • CATH database hierarchically classifies protein domains
    • Based on Class, Architecture, Topology, and Homologous superfamily
    • Facilitates structural and evolutionary analysis of proteins
  • Retrieval methods include web interfaces, downloadable datasets, and APIs
    • Search by protein sequence, family name, or accession number
    • Programmatic access for large-scale domain analysis and annotation

Genomic data retrieval

  • retrieval involves accessing and analyzing large-scale genetic information from various organisms
  • These resources are essential for understanding genome structure, function, and evolution in bioinformatics research

Genome browsers

  • Interactive web-based tools for visualizing and exploring genomic data
    • Display gene annotations, regulatory elements, and experimental data tracks
    • Allow users to navigate through chromosomes and zoom in on specific regions
  • UCSC Genome Browser provides a wealth of genomic data and annotation tracks
    • Supports multiple species and genome assemblies
    • Custom track upload feature for visualizing user-generated data
  • Ensembl genome browser focuses on vertebrate genomes and comparative genomics
    • Offers tools for variant effect prediction and regulatory feature analysis
    • data mining tool for extracting specific genomic datasets
  • JBrowse is a fast, embeddable genome browser built with JavaScript
    • Supports large-scale genomic data visualization
    • Customizable and extensible through plugins

Ensembl and UCSC

  • Ensembl project provides genome annotation and analysis for vertebrates and other eukaryotic species
    • Automated pipeline for gene prediction and functional annotation
    • Comparative genomics resources for studying evolution and conservation
  • UCSC Genome Browser hosts genomic data for a wide range of organisms
    • Includes both reference genomes and draft assemblies
    • Table Browser tool for extracting specific genomic regions or features
  • Both platforms offer programmatic access through APIs and data downloads
    • REST APIs for querying genomic information
    • FTP servers for bulk data retrieval and local analysis
  • Genome coordinate systems and liftOver tools
    • Convert genomic coordinates between different genome assemblies
    • Facilitate comparison of data from different sources or versions

Comparative genomics resources

  • Ensembl Compara database for multi-species comparisons
    • Whole-genome alignments and synteny information
    • Gene trees and orthology/paralogy relationships
  • UCSC Genome Browser's comparative genomics tracks
    • Conservation scores (PhastCons, PhyloP) for identifying functional elements
    • Chain and net alignments for cross-species comparisons
  • OrthoMCL database for identifying ortholog groups across multiple species
    • Clustering algorithm based on sequence similarity and phylogenetic relationships
  • VISTA tools for comparative sequence analysis
    • Visualization of sequence conservation across species
    • Identification of conserved non-coding elements

Literature and citation databases

  • Literature and citation databases are essential resources for accessing scientific publications and tracking research impact in bioinformatics
  • These databases facilitate literature searches, citation analysis, and staying up-to-date with the latest research findings

PubMed and MEDLINE

  • serves as the primary interface for searching biomedical literature
    • Provides access to over 30 million citations from and other life science journals
    • Covers fields including medicine, nursing, dentistry, veterinary medicine, and preclinical sciences
  • MEDLINE forms the core bibliographic database of the National Library of Medicine (NLM)
    • Contains citations and abstracts from thousands of biomedical journals
    • Uses Medical Subject Headings (MeSH) for consistent indexing and searching
  • Advanced search features in PubMed
    • Boolean operators for combining search terms
    • Field tags for targeting specific citation elements (title, author, journal)
    • Filters for publication types, dates, and study characteristics
  • PubMed Central (PMC) offers free full-text access to a subset of PubMed articles
    • Repository of open-access biomedical and life sciences journal literature
  • E-utilities provide programmatic access to PubMed and other NCBI databases
    • Allow for automated literature searches and data retrieval

Google Scholar vs Web of Science

  • offers a broad, interdisciplinary approach to academic literature searching
    • Covers a wide range of academic disciplines and publication types
    • Includes non-peer-reviewed sources such as preprints and technical reports
    • Provides citation counts and "Cited by" links for impact assessment
  • focuses on high-quality, peer-reviewed publications
    • Curated database with selective journal inclusion criteria
    • Offers comprehensive citation analysis and bibliometric tools
    • Provides Journal Impact Factor and other publication metrics
  • Coverage differences
    • Google Scholar includes a broader range of sources but may have less consistent quality control
    • Web of Science offers more detailed metadata and rigorous indexing
  • Search capabilities
    • Google Scholar uses natural language processing for more flexible searching
    • Web of Science provides more precise field-specific searches and advanced query options
  • Citation analysis features
    • Both platforms offer citation tracking and "Cited by" functionality
    • Web of Science provides more advanced citation reports and network visualization tools

Data integration and cross-referencing

  • Data integration and cross-referencing in bioinformatics involve combining information from multiple databases to create a more comprehensive understanding of biological systems
  • These techniques are crucial for leveraging diverse data sources and uncovering complex relationships in biological research

Database identifiers and accessions

  • Unique identifiers assigned to biological entities for unambiguous referencing
    • Accession numbers for sequences (GenBank, UniProt)
    • Database-specific IDs for genes, proteins, and other entities
  • Standardized identifier formats ensure consistency across databases
    • NCBI GenBank accessions (e.g., NC_000001.11 for human chromosome 1)
    • UniProtKB accessions (e.g., P04637 for human p53 protein)
  • Version numbers track updates and changes to database entries
    • Typically appended to accession numbers (e.g., NM_000546.5)
  • Persistent identifiers provide stable references to data objects
    • Digital Object Identifiers (DOIs) for datasets and publications
    • Life Science Identifiers (LSIDs) for biological entities

Linking between databases

  • Cross-references connect related information across different databases
    • Gene-protein associations (NCBI Gene to UniProtKB)
    • Sequence-structure relationships (UniProtKB to PDB)
  • Hyperlinks in web interfaces facilitate navigation between related entries
    • Allow users to explore connected information seamlessly
  • Programmatic methods for following database links
    • APIs provide functions to retrieve linked data programmatically
    • ID mapping services convert between different identifier systems
  • Ontologies and controlled vocabularies enable semantic linking
    • Gene Ontology terms link genes and proteins based on function
    • Disease ontologies connect genetic variants to clinical phenotypes

Data warehouses and portals

  • Integrated resources combining data from multiple primary databases
    • Ensembl integrates genomic, transcriptomic, and variation data
    • provides customizable data warehouses for various model organisms
  • Web portals offer unified access to diverse biological data types
    • NCBI's Entrez system links multiple databases through a common interface
    • EBI's data resources accessible through a centralized portal
  • Data federation approaches for virtual integration
    • BioMart enables queries across distributed databases
    • Distributed Annotation System (DAS) for sharing genome annotations
  • Value-added integration through data analysis and annotation
    • integrates protein-protein interaction data with functional information
    • MetaCyc integrates metabolic pathway data with enzyme and compound information

Programmatic data access

  • Programmatic data access in bioinformatics enables automated retrieval and analysis of large-scale biological data
  • These methods are essential for developing bioinformatics workflows, pipelines, and tools that can efficiently process and integrate diverse data sources

REST APIs for bioinformatics

  • Representational State Transfer (REST) APIs provide a standardized approach for accessing web-based resources
    • Use HTTP methods (GET, POST, PUT, DELETE) for data operations
    • Return data in machine-readable formats (JSON, XML)
  • NCBI E-utilities offer RESTful access to various NCBI databases
    • ESearch for querying databases
    • EFetch for retrieving full records
    • ELink for finding related entries across databases
  • EBI REST APIs provide programmatic access to numerous bioinformatics tools and databases
    • Ensembl REST API for genomic data retrieval
    • UniProt REST API for protein information
  • Benefits of REST APIs in bioinformatics
    • Language-agnostic, allowing integration with various programming environments
    • Stateless nature facilitates scalability and caching
    • Well-suited for web and mobile application development

Database-specific APIs

  • NCBI Entrez Programming Utilities (E-utilities) for accessing NCBI databases
    • Supports both REST and SOAP protocols
    • Provides fine-grained control over search and retrieval operations
  • Ensembl REST API for accessing genomic data and annotations
    • Endpoints for retrieving sequence, variation, and regulatory data
    • Comparative genomics functions for cross-species analysis
  • UniProt Programmatic Access for protein data retrieval
    • RESTful API for querying and downloading protein information
    • SPARQL endpoint for semantic web queries
  • PDB RESTful Web Service for structural biology data
    • Retrieve atomic coordinates, experimental details, and ligand information
    • Search for structures based on various criteria

Batch retrieval methods

  • Bulk download options for retrieving large datasets
    • FTP servers provided by major databases (NCBI, EBI, UniProt)
    • Compressed file formats for efficient data transfer (gzip, tar)
  • Command-line tools for batch data retrieval
    • NCBI's EDirect utilities for scripting Entrez database queries
    • EBI's wsdbfetch for retrieving entries from multiple databases
  • API-based batch retrieval methods
    • POST requests for submitting multiple identifiers in a single API call
    • Asynchronous job submission for large-scale data retrieval tasks
  • Database-specific batch retrieval systems
    • NCBI Batch Entrez for retrieving multiple records simultaneously
    • UniProt's Retrieve/ID mapping tool for batch protein data retrieval

Data submission best practices

  • Data submission best practices in bioinformatics ensure the quality, integrity, and usability of submitted data
  • These practices are crucial for maintaining the reliability and value of biological databases for the scientific community

Metadata standards

  • Minimum Information for Biological and Biomedical Investigations () guidelines
    • Provide checklists for reporting various types of biological experiments
    • Examples include MIAME for microarray experiments and MINSEQE for sequencing experiments
  • Ontologies and controlled vocabularies for consistent terminology
    • Gene Ontology (GO) for describing gene functions and cellular components
    • Sequence Ontology (SO) for annotating genomic features
  • Data standards for specific data types
    • format for raw sequencing data
    • formats for sequence alignment data
  • Metadata schemas for describing experimental contexts
    • ISA-Tab format for structuring metadata across omics experiments
    • MAGE-TAB for microarray gene expression data

Data validation tools

  • Sequence validation tools check for errors and inconsistencies
    • NCBI's VecScreen identifies vector contamination in nucleotide sequences
    • EBI's Webin validation service checks submitted sequences for format compliance
  • Ontology term validators ensure correct usage of standardized terminology
    • OBO-Edit for validating ontology structures and relationships
    • Ontology Lookup Service (OLS) for verifying ontology terms
  • Format-specific validators for various data types
    • SAMtools for validating SAM/BAM files
    • BioJSON validator for checking JSON-formatted biological data
  • Quality control pipelines for comprehensive data validation
    • workflow system for creating custom QC pipelines
    • Nextflow for building scalable and reproducible data processing workflows

Embargo and release policies

  • Data release policies define timelines for making submitted data publicly available
    • Immediate release for certain data types (e.g., raw sequencing data)
    • Embargoed release for allowing prepublication analysis
  • Database-specific embargo options
    • GenBank's "hold until publication" feature for sequence data
    • PDB's option to delay structure release for up to one year
  • Coordination with journal publication schedules
    • Synchronizing data release with article publication dates
    • Providing accession numbers for inclusion in manuscripts
  • Data access levels during embargo periods
    • Restricted access for data submitters and collaborators
    • Anonymous reviewer access for peer review processes

Ethical considerations

  • Ethical considerations in bioinformatics data management are crucial for protecting individual privacy, ensuring responsible use of genetic information, and promoting scientific integrity
  • These considerations guide the development of policies and practices for handling sensitive biological data
  • Informed consent processes for collecting and using biological samples and data
    • Clear explanation of potential uses and sharing of genetic information
    • Options for participants to specify data usage preferences
  • De-identification and anonymization techniques
    • Removal of personal identifiers from genomic and clinical data
    • Use of pseudonyms or codes to protect individual identities
  • Data access controls and authorization mechanisms
    • Tiered access levels based on data sensitivity and user roles
    • Two-factor authentication for accessing sensitive information
  • Compliance with data protection regulations
    • General Data Protection Regulation (GDPR) in the European Union
    • Health Insurance Portability and Accountability Act (HIPAA) in the United States

Sensitive genetic information

  • Handling of clinically relevant genetic variants
    • Protocols for returning incidental findings to research participants
    • Ethical considerations for disclosing disease risk information
  • Protection of ancestry and population-level genetic data
    • Safeguarding information that could lead to group stigmatization
    • Responsible reporting of population genetics research findings
  • Genetic data encryption and secure storage
    • Use of strong encryption algorithms for data at rest and in transit
    • Secure computing environments for analyzing sensitive genetic data
  • Ethical review processes for genetic research projects
    • Institutional Review Board (IRB) approval for human subjects research
    • Consideration of potential societal impacts of genetic studies

Open access vs restricted access

  • Balancing data sharing with privacy protection
    • Controlled access mechanisms for sensitive datasets
    • Data Use Agreements (DUAs) specifying terms of data access and usage
  • Tiered access models for different data types
    • for non-sensitive, aggregated data
    • Restricted access for individual-level genomic and phenotypic data
  • Data sharing consortia and federated access systems
    • Global Alliance for Genomics and Health (GA4GH) data sharing framework
    • Database of Genotypes and Phenotypes (dbGaP) for controlled access to study data
  • Promoting reproducibility through open data practices
    • Encouraging sharing of analysis code and workflows
    • Providing sufficient metadata for replication of research findings
  • Future trends in bioinformatics data management focus on addressing the challenges of increasing data volume, complexity, and integration needs
  • These emerging technologies and approaches aim to enhance data accessibility, security, and analysis capabilities in the field

Cloud-based data storage

  • Scalable storage solutions for handling large-scale genomic and multi-omics data
    • Amazon Web Services (AWS) for life sciences
    • Google Cloud Platform's genomics tools
  • Cloud-native bioinformatics platforms and workflows
    • Galaxy CloudMan for deploying analysis environments
    • Terra platform for collaborative genomic analysis
  • Data lakes for storing diverse biological data types
    • Centralized repositories for raw and processed data
    • Support for various file formats and data structures
  • Edge computing for distributed data processing
    • Local processing of sequencing data to reduce transfer bottlenecks
    • Integration with Internet of Things (IoT) devices for real-time data collection

Blockchain in data integrity

  • Immutable ledgers for tracking and modifications
    • Ensuring transparency in data generation and analysis pipelines
    • Verifying the authenticity of shared datasets
  • Smart contracts for automating data access and usage agreements
    • Enforcing data use policies and consent management
    • Facilitating secure data sharing between institutions
  • Decentralized storage systems for biological data
    • Increased resilience against data loss or tampering
    • Potential for patient-controlled health and genomic data
  • Blockchain-based platforms for scientific collaboration
    • Incentivizing data sharing and reproducible research
    • Creating verifiable records of scientific contributions

AI in data retrieval and submission

  • Machine learning algorithms for intelligent data search and retrieval
    • Natural language processing for improved literature searches
    • Semantic similarity measures for finding related biological entities
  • Automated data curation and quality control
    • AI-powered systems for detecting anomalies and inconsistencies in submitted data
    • Machine learning models for predicting data quality and completeness
  • Intelligent assistants for guiding data submission processes
    • Chatbots for providing real-time assistance to data submitters
    • Automated metadata generation based on submitted data content
  • Deep learning approaches for integrating heterogeneous biological data
    • Multi-modal data fusion for comprehensive biological insights
    • Graph neural networks for analyzing complex biological networks
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© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.

© 2024 Fiveable Inc. All rights reserved.
AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
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