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<div class="search"><form method="get" action="/gquery/"><div class="search_form"><label for="database" class="offscreen_noflow">Search database</label><select id="database"><optgroup label="Recent"><option value="gquery" selected="selected" class="last">All Databases</option></optgroup><optgroup label="All"><option value="gquery">All Databases</option><option value="assembly">Assembly</option><option value="biocollections">Biocollections</option><option value="bioproject">BioProject</option><option value="biosample">BioSample</option><option value="books">Books</option><option value="clinvar">ClinVar</option><option value="cdd">Conserved Domains</option><option value="gap">dbGaP</option><option value="dbvar">dbVar</option><option value="gene">Gene</option><option value="genome">Genome</option><option value="gds">GEO DataSets</option><option value="geoprofiles">GEO Profiles</option><option value="gtr">GTR</option><option value="ipg">Identical Protein Groups</option><option value="medgen">MedGen</option><option value="mesh">MeSH</option><option value="nlmcatalog">NLM Catalog</option><option value="nuccore">Nucleotide</option><option value="omim">OMIM</option><option value="pmc">PMC</option><option value="protein">Protein</option><option value="proteinclusters">Protein Clusters</option><option value="protfam">Protein Family Models</option><option value="pcassay">PubChem BioAssay</option><option value="pccompound">PubChem Compound</option><option value="pcsubstance">PubChem Substance</option><option value="pubmed">PubMed</option><option value="snp">SNP</option><option value="sra">SRA</option><option value="structure">Structure</option><option value="taxonomy">Taxonomy</option><option value="toolkit">ToolKit</option><option value="toolkitall">ToolKitAll</option><option value="toolkitbookgh">ToolKitBookgh</option></optgroup></select><div class="nowrap"><label for="term" class="offscreen_noflow" accesskey="/">Search term</label><div class="nowrap"><input type="text" name="term" id="term" title="Search All Databases" value="" class="jig-ncbiclearbutton jig-ncbiautocomplete" data-jigconfig="isEnabled:false,disableUrl:'NcbiSearchBarAutoComplCtrl'" autocomplete="off" data-sbconfig="ds:'no',pjs:'no',afs:'yes'" /></div><button id="search" type="submit" class="button_search nowrap" cmd="go">Search</button></div></div></form></div>
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<h2>Site Map</h2>
<ul id="index">
<li>
<a href="#_A">A</a>
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<a href="#_B">B</a>
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<a href="#_C">C</a>
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<a href="#_D">D</a>
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<a href="#_T">T</a>
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<a href="#_V">V</a>
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<p>Featured items are in bold.</p>
<ul id="resource-list">
<h3 id="_A">A</h3>
<ul>
<li>
<a href="/assembly" title="&#10; &#10;Genome assembly organization and additional information&#10; ">Assembly</a>
</li>
</ul>
<h3 id="_B">B</h3>
<ul>
<li class="featured">
<a href="https://blast.ncbi.nlm.nih.gov" title="&#10; &#10;Tool for finding local regions of sequence similarity&#10; ">Basic Local Alignment Search Tool (BLAST)</a>
</li>
<li>
<a href="/sites/batchentrez" title="&#10; &#10;Retrieve sequence records from a file of identifiers.&#10; ">Batch Entrez</a>
</li>
<li>
<a href="/biocollections" title="&#10; &#10;specimen collection biorepositories&#10; ">BioCollections</a>
</li>
<li class="featured">
<a href="/bioproject" title="&#10; &#10;Genomics, functional genomics, and genetics studies &amp; links to corresponding data&#10; ">BioProject (formerly Genome Project)</a>
</li>
<li>
<a href="https://submit.ncbi.nlm.nih.gov/subs/bioproject/" title="&#10; &#10;Register BioProject studies&#10; ">BioProject Submission</a>
</li>
<li>
<a href="/biosample" title="&#10; &#10;Biosamples - source materials used in experimental assays.&#10; ">BioSample</a>
</li>
<li class="featured">
<a href="https://blast.ncbi.nlm.nih.gov/Blast.cgi?CMD=Web&amp;PAGE_TYPE=BlastDocs&amp;DOC_TYPE=Download" title="&#10; &#10;BLAST programs for a local computer&#10; ">BLAST (Stand-alone)</a>
</li>
<li>
<a href="https://blast.ncbi.nlm.nih.gov/Blast.cgi?PAGE_TYPE=BlastSearch&amp;PROG_DEF=blastn&amp;BLAST_PROG_DEF=megaBlast&amp;SHOW_DEFAULTS=on&amp;BLAST_SPEC=MicrobialGenomes" title="&#10; &#10;Finds similar sequences within microbial genomes&#10; ">BLAST Microbial Genomes</a>
</li>
<li>
<a href="https://blast.ncbi.nlm.nih.gov/Blast.cgi?PROGRAM=blastn&amp;BLAST_PROGRAMS=megaBlast&amp;PAGE_TYPE=BlastSearch&amp;SHOW_DEFAULTS=on&amp;BLAST_SPEC=RefseqGene" title="Finds similar sequences within the RefSeqGene/LRG dataset.">BLAST RefSeqGene</a>
</li>
<li>
<a href="https://blast.ncbi.nlm.nih.gov/Blast.cgi?CMD=Web&amp;PAGE_TYPE=BlastDocs" title="&#10; &#10;Variety of documents describing NCBI BLAST services&#10; ">BLAST Tutorials and Guides</a>
</li>
<li class="featured">
<a href="/books" title="&#10; &#10;Online books and reports&#10; ">Bookshelf</a>
</li>
</ul>
<h3 id="_C">C</h3>
<ul>
<li>
<a href="/Structure/cdtree/cdtree.shtml" title="&#10; &#10;Program for viewing, updating and creating protein domains and hierarchies&#10; ">CDTree</a>
</li>
<li>
<a href="/genome/cgv/" title="Compare genomes based on whole genomeassembly-assembly alignments">Comparative Genome Viewer (CGV)</a>
</li>
<li>
<a href="https://clinicaltrials.gov/" title="&#10; &#10;a registry and results database of publicly and privately supported clinical studies&#10; ">ClincialTrials.gov</a>
</li>
<li>
<a href="/clinvar" title="&#10; &#10;variation aggregator for clincial assertions&#10; ">ClinVar</a>
</li>
<li>
<a href="/clinvar/docs/submit/" title="&#10; &#10;Guidelines and instructions for to ClinVar&#10; ">ClinVar Submissions</a>
</li>
<li class="featured">
<a href="/Structure/CN3D/cn3d.shtml" title="&#10; &#10;Program for viewing 3D structures and alignments&#10; ">Cn3D</a>
</li>
<li>
<a href="/tools/cobalt/re_cobalt.cgi" title="&#10; &#10;Protein multiple sequence alignment tool&#10; ">COBALT</a>
</li>
<li>
<a href="/books/NBK2345" title="&#10; &#10;Short reports on recent biological discoveries that demonstrate use of NCBI tools&#10; ">Coffee Break</a>
</li>
<li>
<a href="/Structure/" title="&#10; &#10;Computational Resources from NCBI's Structure Group&#10; ">Computational Resources from NCBI's Structure Group </a>
</li>
<li>
<a href="/projects/CCDS/CcdsBrowse.cgi" title="&#10; &#10;Collaborative effort to provide standard annotations for human and mouse genes&#10; ">Consensus CDS (CCDS)</a>
</li>
<li>
<a href="/Structure/lexington/lexington.cgi?cmd=rps" title="&#10; &#10;Tool that displays and retrieves proteins according to their domain architecture&#10; ">Conserved Domain Architecture Retrieval Tool (CDART)</a>
</li>
<li class="featured">
<a href="/cdd" title="&#10; &#10;Database of conserved protein domains represented by multiple sequence alignments&#10; ">Conserved Domain Database (CDD)</a>
</li>
<li class="featured">
<a href="/Structure/cdd/wrpsb.cgi" title="&#10; &#10;Locates conserved domains within a protein sequence&#10; ">Conserved Domain Search Service (CD Search)</a>
</li>
</ul>
<h3 id="_D">D</h3>
<ul>
<li class="featured">
<a href="/dbvar" title="&#10; &#10;A database of genomic structural variation&#10; ">Database of Genomic Structural Variation (dbVar)</a>
</li>
<li>
<a href="/projects/gap/cgi-bin/about.cgi" title="&#10; &#10;Policies and procedures for submitting data to dbGaP&#10; ">Database of Genotype and Phenotype (dbGaP) Data Submission Policies</a>
</li>
<li class="featured">
<a href="/gap" title="&#10; &#10;Genotype/Phenotype association studies&#10; ">Database of Genotypes and Phenotypes (dbGaP)</a>
</li>
<li class="featured">
<a href="/snp" title="&#10; &#10;Database of short nucleotide sequence variations.&#10; ">Database of Short Genetic Variations (dbSNP)</a>
</li>
</ul>
<h3 id="_E">E</h3>
<ul>
<li class="featured">
<a href="/books/NBK25501/ " title="&#10; &#10;URL application programming interface for searching, linking and downloading data within NCBI's Entrez system&#10; ">E-Utilities</a>
</li>
<li>
<a href="/Class/PowerTools/eutils/ebot/ebot.cgi" title="&#10; &#10;Builds custom Perl scripts that execute E-utility pipelines&#10; ">Ebot</a>
</li>
</ul>
<h3 id="_F">F</h3>
<ul>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/blast/db/" title="&#10; &#10;Databases for stand-alone BLAST&#10; ">FTP: BLAST Databases</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pub/mmdb/cdd/" title="&#10; &#10;Download a database of conserved protein domains represented by multiple sequence alignments&#10; ">FTP: CDD</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pub/clinvar" title="&#10; &#10;FTP site for ClinVar data&#10; ">FTP: ClinVar Data</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/dbgap" title="&#10; &#10;Publicly available sections of genotype/phenotype association studies&#10; ">FTP: dbGAP Open-Access Data</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/blast/db/FASTA" title="&#10; &#10;BLAST databases in FASTA format&#10; ">FTP: FASTA BLAST Databases</a>
</li>
<li>
<a href="/genbank/GenBankFtp.html" title="&#10; &#10;Database of submitted nucleotide sequences&#10; ">FTP: GenBank</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/gene/" title="&#10; &#10;Downloadable database of gene loci and associated transcripts and proteins&#10; ">FTP: Gene</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pub/geo/" title="&#10; &#10;Database of gene expression profiles and datasets&#10; ">FTP: Gene Expression Omnibus (GEO) Profiles and Datasets</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/genomes/" title="&#10; &#10;Downloadable database of curated genomic DNA sequences&#10; ">FTP: Genome</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/genomes/MapView" title="&#10; &#10;Mapping data underlying the NCBI Map Viewer&#10; ">FTP: Genome Mapping Data</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/ncbi-asn1/protein_fasta/" title="&#10; &#10;Conceptual translations of protein coding sequences in GenBank&#10; ">FTP: GenPept</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pub/taxonomy/" title="&#10; &#10;Download the NCBI taxonomy tree&#10; ">FTP: NCBI Taxonomy</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pubchem/" title="&#10; &#10;Contributed chemical substances, standardized chemical structures and bioactivity data&#10; ">FTP: PubChem</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/refseq/release/" title="&#10; &#10;Curated sequences produced by NCBI&#10; ">FTP: RefSeq</a>
</li>
<li>
<a href="/Traces/sra/sra.cgi?cmd=show&amp;f=faspftp_runs_v1&amp;m=downloads&amp;s=download_sra" title="&#10; &#10;Short reads derived from next-generation sequencing&#10; ">FTP: Sequence Read Archive (SRA) Download Facility</a>
</li>
<li>
<a href="/Ftp/" title="&#10; &#10;Site for downloading NCBI data and software&#10; ">FTP: Site</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/sky-cgh/" title="&#10; &#10;Download database of chromosomal aberrations in cancer&#10; ">FTP: SKY/M-Fish and CGH Data</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/snp/" title="&#10; &#10;Downloadable data for SNP.&#10; ">FTP: SNP</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/mmdb/" title="&#10; &#10;Download a database of 3D macromolecular structures derived from PDB&#10; ">FTP: Structure (MMDB)</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pub/TraceDB" title="&#10; &#10;Download DNA chromatograms, base calls, and quality estimates for single-pass reads&#10; ">FTP: Trace Archive</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/pub/UniVec/" title="&#10; &#10;Database used for detecting vector contamination&#10; ">FTP: UniVec</a>
</li>
<li>
<a href="https://ftp.ncbi.nlm.nih.gov/genbank/wgs" title="&#10; &#10;Sequences from Whole Genome Shotgun sequencing projects&#10; ">FTP: Whole Genome Shotgun Sequences</a>
</li>
</ul>
<h3 id="_G">G</h3>
<ul>
<li class="featured">
<a href="/genbank/" title="&#10; &#10;DNA and RNA sequences submitted to NCBI&#10; ">GenBank</a>
</li>
<li class="featured">
<a href="/WebSub/?tool=genbank" title="&#10; &#10;Web tool for simple submissions of nucleotide sequences&#10; ">GenBank: BankIt</a>
</li>
<li>
<a href="/WebSub/index.cgi?tool=barcode" title="&#10; &#10;Tool to submit short nucleotide sequences used for species identification.&#10; ">GenBank: Barcode</a>
</li>
<li class="featured">
<a href="/projects/Sequin" title="&#10; &#10;Software tool for complex submissions of nucleotide sequences&#10; ">GenBank: Sequin</a>
</li>
<li class="featured">
<a href="/genbank/tbl2asn2.html" title="&#10; &#10;Command-line program for submitting sequence data&#10; ">GenBank: tbl2asn</a>
</li>
<li class="featured">
<a href="/gene" title="&#10; &#10;Database of gene loci and associated transcripts and proteins&#10; ">Gene</a>
</li>
<li>
<a href="/geo/query/blast.html" title="&#10; &#10;Tool to locate sequences on gene expression platforms using BLAST&#10; ">Gene Expression Omnibus (GEO) BLAST</a>
</li>
<li class="featured">
<a href="/geo/" title="&#10; &#10;Gene Expression Omnibus (GEO) Database&#10; ">Gene Expression Omnibus (GEO) Database </a>
</li>
<li class="featured">
<a href="/gds" title="&#10; &#10;Curated collections of gene expression data sets&#10; ">Gene Expression Omnibus (GEO) Datasets</a>
</li>
<li class="featured">
<a href="/geoprofiles/" title="&#10; &#10;Database of gene expression Profiles for individual sequences&#10; ">Gene Expression Omnibus (GEO) Profiles</a>
</li>
<li>
<a href="/projects/geo/info/submission.html" title="&#10; &#10;Online tool for submitting data to GEO&#10; ">Gene Expression Omnibus (GEO) Web Deposit</a>
</li>
<li>
<a href="/books/NBK1116/" title="Review articles for disease descriptions and genetic involvement.">GeneReviews</a>
</li>
<li>
<a href="/gene/about-generif" title="&#10; &#10;Annotate gene record with function/protein data and associated PubMed ID&#10; ">GeneRIF</a>
</li>
<li>
<a href="/books/NBK22183/" title="&#10; &#10;Articles about genetic disorders&#10; ">Genes and Disease</a>
</li>
<li>
<a href="/Taxonomy/taxonomyhome.html/index.cgi?chapter=cgencodes" title="&#10; &#10;Finds the genetic translation code for a taxonomy node&#10; ">Genetic Codes</a>
</li>
<li>
<a href="/gtr/" title="&#10; &#10;Medical genetics testing information&#10; ">Genetic Testing Registry (GTR)</a>
</li>
<li>
<a href="/gtr/docs/submit/" title="&#10; &#10;gtr submission info&#10; ">Genetic Testing Registry (GTR) Submissions</a>
</li>
<li class="featured">
<a href="/genome" title="&#10; &#10;Curated genomic DNA sequences&#10; ">Genome</a>
</li>
<li>
<a href="/blast/Blast.cgi" title="&#10; &#10;Aligns sequences to a genomic assembly&#10; ">Genome BLAST</a>
</li>
<li>
<a href="/genome/gdv" title="&#10; &#10;an interactive genome browser displaying default, customized, and user-supplied data tracks &#10; ">Genome Data Viewer (GDV)</a>
</li>
<li>
<a href="/projects/genome/assembly/grc/" title="&#10; &#10;Genome Reference Consortium (GRC): Tools and information for the human and mouse reference genomes.&#10; ">Genome Reference Consortium (GRC)</a>
</li>
</ul>
<h3 id="_H">H</h3>
<ul>
<li>
<a href="/RefSeq/HIVInteractions" title="&#10; &#10;Summary of all known HIV-1 protein interactions.&#10; ">HIV-1, Human Protein Interaction Database</a>
</li>
</ul>
<h3 id="_I">I</h3>
<ul>
<li>
<a href="/ipg" title="&#10; &#10;A collection of consolidated records describing proteins identified in annotated coding regions in GenBank and RefSeq, as well as SwissProt and PDB protein sequences. This resource allows investigators to obtain more targeted search results and quickly identify a protein of interest.&#10; ">Identical Protein Groups</a>
</li>
<li>
<a href="/genomes/FLU/FLU.html" title="&#10; &#10;Data from the NIAID Influenza Genome Sequencing Project&#10; ">Influenza Virus</a>
</li>
</ul>
<h3 id="_J">J</h3>
<ul>
<li class="featured">
<a href="/nlmcatalog/journals" title="&#10; &#10;Information on journals cited by NCBI records&#10; ">Journals in NCBI Databases</a>
</li>
</ul>
<h3 id="_L">L</h3>
<ul>
<li>
<a href="/projects/linkout/" title="&#10; &#10;Service to provide links from NCBI records to external resources.&#10; ">LinkOut</a>
</li>
</ul>
<h3 id="_M">M</h3>
<ul>
<li>
<a href="/medgen" title="&#10; &#10;information about medical genetics&#10; ">MedGen</a>
</li>
<li>
<a href="http://www.nlm.nih.gov/databases/journal.html" title="&#10; &#10;Obtain a lease to download PubMed from the National Library of Medicine&#10; ">MEDLINE (Leasing)</a>
</li>
<li class="featured">
<a href="/mesh" title="&#10; &#10;Controlled vocabulary for MEDLINE&#10; ">MeSH Database</a>
</li>
<li>
<a href="/mcgv/" title="CGV is a graphical display for whole genome multiple sequence alignments.">Multiple Comparative Genome Viewer (MCGV)</a>
</li>
<li>
<a href="/tools/msaviewer/" title="&#10; &#10;An interactive MSA Viewer&#10; ">Multiple Sequence Alignment Viewer</a>
</li>
</ul>
<h3 id="_N">N</h3>
<ul>
<li>
<a href="/nlmcatalog" title="&#10; &#10;Catalog of the complete holdings of the National Library of Medicine&#10; ">National Library of Medicine (NLM) Catalog</a>
</li>
<li>
<a href="http://dtd.nlm.nih.gov/" title="&#10; &#10;XML DTDs for exchanging content between publishers and NLM&#10; ">National Library of Medicine (NLM) DTDs</a>
</li>
<li>
<a href="https://ncbi.github.io/cxx-toolkit/" title="&#10; &#10;Searchable documentation of the NCBI C++ software library&#10; ">NCBI C++ Toolkit Manual</a>
</li>
<li>
<a href="/data_specs" title="&#10; &#10;XML DTDs for NCBI databases&#10; ">NCBI Data Specifications</a>
</li>
<li class="featured">
<a href="/education/" title="&#10; &#10;Central page providing links to tutorials and training materials&#10; ">NCBI Education Page</a>
</li>
<li>
<a href="/books/NBK21106/" title="&#10; &#10;Glossary of bioinformatics terms&#10; ">NCBI Glossary</a>
</li>
<li class="featured">
<a href="/books/NBK143764/" title="&#10; &#10;Introductory articles about NCBI resources&#10; ">NCBI Handbook</a>
</li>
<li class="featured">
<a href="/books/NBK3831/" title="&#10; &#10;Online, searchable help documentation&#10; ">NCBI Help Manual</a>
</li>
<li class="featured">
<a href="/news" title="&#10; &#10;NCBI's News site&#10; ">NCBI News</a>
</li>
<li>
<a href="/pathogens/" title="&#10; &#10;A project involving the collection and analysis of bacterial pathogen genomic sequences originating from food, environmental and patient isolates. Currently, an automated pipeline clusters and identifies sequences supplied primarily by public health laboratories to assist in the investigation of foodborne disease outbreaks and discover potential sources of food contamination.&#10; ">NCBI Pathogen Detection Project</a>
</li>
<li>
<a href="/IEB/ToolBox/index.cgi" title="&#10; &#10;The NCBI C/C++ software library&#10; ">NCBI Toolbox</a>
</li>
<li>
<a href="http://www.nihms.nih.gov/" title="&#10; &#10;NIH-funded manuscript submission system.&#10; ">NIH Manuscript Submissions (NIHMS)</a>
</li>
<li class="featured">
<a href="/nuccore" title="&#10; &#10;Nucleotide sequence data in GenBank and RefSeq&#10; ">Nucleotide Database</a>
</li>
</ul>
<h3 id="_O">O</h3>
<ul>
<li class="featured">
<a href="/omim" title="&#10; &#10;Database of human genes and genetic disorders&#10; ">Online Mendelian Inheritance in Man (OMIM)</a>
</li>
<li>
<a href="/orffinder/" title="&#10; &#10;Tool for finding open reading frames in a query sequence&#10; ">Open Reading Frame Finder (ORF Finder)</a>
</li>
<li>
<a href="/projects/SNP/osiris" title="&#10; &#10;A public domain quality assurance software package that facilitates the assessment of multiplex short tandem repeat (STR) DNA profiles based on laboratory-specific protocols.&#10; ">OSIRIS</a>
</li>
</ul>
<h3 id="_P">P</h3>
<ul>
<li>
<a href="/gap/PheGenI " title="&#10; &#10;Human phenotype-genotype relationships&#10; ">Phenotype-Genotype Integrator (PheGenI) </a>
</li>
<li class="featured">
<a href="/popset" title="&#10; &#10;Sets of nucleotide sequences representing a population&#10; ">PopSet</a>
</li>
<li class="featured">
<a href="/tools/primer-blast" title="&#10; &#10;Designs PCR primers and analyzes them for target specificity using BLAST.&#10; ">Primer-BLAST</a>
</li>
<li class="featured">
<a href="/sutils/static/prosplign/prosplign.html" title="&#10; &#10;Tool for aligning proteins to genomic DNA&#10; ">ProSplign</a>
</li>
<li class="featured">
<a href="/proteinclusters" title="&#10; &#10;Clusters of related proteins from prokaryotes and organelles&#10; ">Protein Clusters</a>
</li>
<li class="featured">
<a href="/protein" title="&#10; &#10;Protein sequence data&#10; ">Protein Database</a>
</li>
<li class="featured">
<a href="/protfam" title="&#10; Collection of models representing homologous proteins with a common function&#10; ">Protein Family Models</a>
</li>
<li>
<a href="/Class/Structure/pssm/pssm_viewer.cgi" title="&#10; &#10;Tool that displays and manipulates position-specific score matrices&#10; ">PSSM Viewer</a>
</li>
<li class="featured">
<a href="/pcassay" title="&#10; &#10;Contributed bioactivity data for PubChem Substances&#10; ">PubChem BioAssay</a>
</li>
<li class="featured">
<a href="/pccompound" title="&#10; &#10;Unique, standardized chemical structures&#10; ">PubChem Compound</a>
</li>
<li>
<a href="https://pubchem.ncbi.nlm.nih.gov/pc_fetch/pc_fetch.cgi" title="&#10; &#10;Web facility for downloading PubChem Compound and Substance data&#10; ">PubChem Download Service</a>
</li>
<li>
<a href="https://pubchem.ncbi.nlm.nih.gov/pug/pughelp.html" title="&#10; &#10;PubChem API for downloads and structure searches&#10; ">PubChem Power User Gateway (PUG)</a>
</li>
<li>
<a href="https://pubchem.ncbi.nlm.nih.gov/standardize/standardize.cgi" title="&#10; &#10;Preview a substance's standardized structure&#10; ">PubChem Standardization Service</a>
</li>
<li class="featured">
<a href="https://pubchem.ncbi.nlm.nih.gov/search/search.cgi" title="&#10; &#10;Searches PubChem Compound by chemical structure&#10; ">PubChem Structure Search</a>
</li>
<li class="featured">
<a href="/pcsubstance" title="&#10; &#10;Provides information on the biological activities of small molecules.&#10; ">PubChem Substance</a>
</li>
<li>
<a href="https://pubchem.ncbi.nlm.nih.gov/upload/#welcome" title="&#10; &#10;Upload data to PubChem Substance and Bioassay&#10; ">PubChem Upload</a>
</li>
<li class="featured">
<a href="/pubmed" title="&#10; &#10;Biomedical literature abstracts&#10; ">PubMed</a>
</li>
<li class="featured">
<a href="/pmc/" title="&#10; &#10;Free, full-text articles&#10; ">PubMed Central (PMC)</a>
</li>
<li>
<a href="/pmc/about/openftlist.html" title="&#10; &#10;Collection of PubMed Central articles available for downloading&#10; ">PubMed Central (PMC) Open-Access Subset</a>
</li>
<li class="featured">
<a href="/pubmed/clinical " title="&#10; &#10;Directory of PubMed queries about clinical topics&#10; ">PubMed Clinical Queries</a>
</li>
<li>
<a href="http://www.nlm.nih.gov/bsd/disted/pubmedtutorial/" title="&#10; &#10;Online tutorials on using PubMed, Entrez and MyNCBI&#10; ">PubMed Tutorials</a>
</li>
</ul>
<h3 id="_R">R</h3>
<ul>
<li class="featured">
<a href="/RefSeq/" title="&#10; &#10;Curated nucleotide and protein sequences produced by NCBI&#10; ">Reference Sequence (RefSeq)</a>
</li>
<li class="featured">
<a href="/refseq/rsg/" title="&#10; &#10;RefSeqGene reference standards for genomic sequences of well-characterized genes&#10; ">RefSeqGene</a>
</li>
<li>
<a href="https://structure.ncbi.nlm.nih.gov/Structure/cblast/cblast.cgi" title="&#10; &#10;find 3D structures from the Molecular Modeling Database (MMDB) that are similar in sequence to a query protein.&#10; ">Related Structures</a>
</li>
<li>
<a href="/retroviruses/" title="&#10; &#10;Tools, maps, and sequence for retroviruses.&#10; ">Retrovirus Resources</a>
</li>
<li>
<a href="/feed/" title="&#10; &#10;RSS feeds available from NCBI&#10; ">RSS Feeds</a>
</li>
</ul>
<h3 id="_S">S</h3>
<ul>
<li>
<a href="/genomes/SARS/SARS.html" title="&#10; &#10;Data for the SARS coronavirus.&#10; ">SARS CoV</a>
</li>
<li class="featured">
<a href="/Traces/sra/sra.cgi?" title="&#10; &#10;Database of sequences reads from next generation sequencing technologies&#10; ">Sequence Read Archive (SRA)</a>
</li>
<li>
<a href="/Traces/sra_sub/sub.cgi?" title="SRA submission guidelines.">Sequence Read Archive Submission</a>
</li>
<li>
<a href="/projects/sviewer/" title="&#10; &#10;An interactive, online display format for sequences, with an embeddable web version available.&#10; ">Sequence Viewer</a>
</li>
<li>
<a href="/projects/SNP/" title="&#10; &#10;Set of custom tools for locating SNPs&#10; ">SNP Database Specialized Search Tools</a>
</li>
<li class="featured">
<a href="https://www.ncbi.nlm.nih.gov/projects/SNP" title="&#10; &#10;The SNP database tools page provides links to the general submission guidelines and to the submission handle request.&#10; ">SNP Submission Tool</a>
</li>
<li class="featured">
<a href="/sutils/splign" title="&#10; &#10;Tool for aligning transcripts to genomic DNA&#10; ">Splign</a>
</li>
<li class="featured">
<a href="/sites/entrez?db=structure" title="&#10; &#10;Database of 3D macromolecular structures derived from PDB&#10; ">Structure (Molecular Modeling Database)</a>
</li>
<li>
<a href="https://submit.ncbi.nlm.nih.gov" title="&#10; &#10;NCBI-wide submission portal&#10; ">Submission Portal</a>
</li>
</ul>
<h3 id="_T">T</h3>
<ul>
<li class="featured">
<a href="/taxonomy" title="&#10; &#10;The NCBI taxonomy tree in Entrez&#10; ">Taxonomy</a>
</li>
<li class="featured">
<a href="/Taxonomy/Browser/wwwtax.cgi?mode=Root" title="&#10; &#10;Displays and links Entrez data to each taxonomic node&#10; ">Taxonomy Browser</a>
</li>
<li class="featured">
<a href="/Taxonomy/CommonTree/wwwcmt.cgi" title="&#10; &#10;Creates custom taxonomic trees&#10; ">Taxonomy Common Tree</a>
</li>
<li>
<a href="/Taxonomy/taxonomyhome.html/index.cgi?chapter=STATISTICS&amp;uncultured=hide&amp;unspecified=hide" title="&#10; &#10;Displays statistics related to the Taxonomy database&#10; ">Taxonomy Statistics</a>
</li>
<li>
<a href="/Taxonomy/TaxIdentifier/tax_identifier.cgi" title="&#10; &#10;Displays the status of a taxonomy ID&#10; ">Taxonomy Status Reports</a>
</li>
<li>
<a href="/genbank/TPA.html" title="&#10; &#10;Sequence annotations submitted for sequences already in GenBank&#10; ">Third Party Annotation (TPA) Database</a>
</li>
<li class="featured">
<a href="/Traces/trace.cgi" title="&#10; &#10;DNA chromatograms, base calls, and quality estimates for single-pass reads.&#10; ">Trace Archive</a>
</li>
<li>
<a href="/Traces/trace.cgi?cmd=show&amp;f=submit&amp;m=doc&amp;s=submit" title="&#10; &#10;Trace submission information.&#10; ">Trace Archive Submission</a>
</li>
<li>
<a href="/tools/treeviewer/" title="a tool for creating and viewing phylogenetic tree data&#10;">Tree Viewer</a>
</li>
</ul>
<h3 id="_V">V</h3>
<ul>
<li>
<a href="/variation/view" title="browser to search and view variations reported in dbSNP, dbVar and ClinVar">Variation Viewer</a>
</li>
<li>
<a href="/tools/vecscreen/" title="&#10; &#10;Tool for detecting vector contamination&#10; ">VecScreen</a>
</li>
<li class="featured">
<a href="/Structure/VAST/vast.html" title="&#10; &#10;Tool that generates 3D structural alignments&#10; ">Vector Alignment Search Tool (VAST)</a>
</li>
<li>
<a href="/genomes/GenomesHome.cgi?" title="&#10; &#10;Comprehensive collection of viral resources.&#10; ">Viral Genomes</a>
</li>
<li>
<a href="/projects/genotyping/formpage.cgi" title="&#10; &#10;Tool for identifying viral genotypes using BLAST&#10; ">Viral Genotyping Tool</a>
</li>
<li>
<a href="/genomes/VirusVariation/" title="&#10; &#10;Data and tools for selected viruses.&#10; ">Virus Variation</a>
</li>
</ul>
</ul>
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