The NCBI Handbook, 2nd editionEditors and ReviewersA Brief History of NCBI’s Formation and GrowthLiteratureNCBI Literature ResourcesNLM CatalogPubMed: The Bibliographic DatabasePubMed CentralBookshelfNLM DTD to NISO JATS Z39.96-2012The NIH Manuscript Submission SystemGenomesWhat’s in a Genome at NCBI?GenBankProtein ClustersEukaryotesCloneGenome Reference ConsortiumEukaryotic Genome Annotation PipelineProkaryotesAbout Prokaryotic Genome Processing and ToolsProkaryotic Genome Annotation PipelineVirusesAbout Viral and Phage Genome Processing and ToolsVirus VariationVariationVariation OverviewThe Database of Genotypes and Phenotypes (dbGaP) and PheGenIThe Database of Short Genetic Variation (dbSNP)dbVarClinVarHealthMedGenClinVarGenes and Gene ExpressionGenes and Gene ExpressionGene Expression Omnibus (GEO)GeneUniGeneNucleotideGenBankProteinNCBI Protein ResourcesProtein ClustersSmall Molecules and Biological AssaysSmall Molecules and Biological ActivitiesNCBI PubChem BioAssay DatabaseToolsThe BLAST Sequence Analysis ToolThe Entrez Search and Retrieval SystemLinkOut: Linking to External Resources from NCBI DatabasesMetadataBioSampleBioProjectGlossary