Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Biomedical Literature | Biomedical Topics | Health Services and Public Health | Intramural Research | History of Medicine | Policies and Guidelines Biomedical Literature PubMed ® Biomedical journal literature. See About PubMed for more information. Learn how to find full text articles in PubMed. Biomedical journal literature. See About PubMed for more information. Learn how to find full text articles in PubMed. MEDLINE ® A free database that contains abstracts and other metadata for biomedical and life sciences journal literature. A free database that contains abstracts and other metadata for biomedical and life sciences journal literature. PubMed Central ® A free full-text archive of biomedical and life sciences journal literature. A free full-text archive of biomedical and life sciences journal literature. LocatorPlus ® Online Catalog LocatorPlus is the Library's online catalog containing catalog records for books, audiovisuals, journals, computer files, and other materials in the Library's collections. LocatorPlus is the Library's online catalog containing catalog records for books, audiovisuals, journals, computer files, and other materials in the Library's collections. Electronic Databases & Directories: Alphabetical List and Subject List Biomedical Topics Computational Molecular Biology BLAST A tool that finds regions of similarity between biological sequences. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance. A tool that finds regions of similarity between biological sequences. The program compares nucleotide or protein sequences to sequence databases and calculates the statistical significance. GenBank ® A database of nucleotide sequences. A database of nucleotide sequences. Molecular Structure and Function A database of macromolecular 3D structures, as well as tools for their visualization and comparative analysis. A database of macromolecular 3D structures, as well as tools for their visualization and comparative analysis. Taxonomy Database A database of taxonomic names of lineages of organisms represented in NCBI's sequence databases. A database of taxonomic names of lineages of organisms represented in NCBI's sequence databases. Conserved Domain Database (CDD) A database to identify the conserved domains present in a protein sequence. A database to identify the conserved domains present in a protein sequence. Reference Sequences (RefSeq) A collection of reference sequences for genomes, gene transcripts, and proteins. A collection of reference sequences for genomes, gene transcripts, and proteins. Vector Alignment Search Tool (VAST) A computer algorithm developed at NCBI and used to identify similar protein 3-dimensional structures ("similar structures") by purely geometric criteria and to identify distant homologs that cannot be recognized by sequence comparison. A computer algorithm developed at NCBI and used to identify similar protein 3-dimensional structures ("similar structures") by purely geometric criteria and to identify distant homologs that cannot be recognized by sequence comparison.

Health Data Standards and Natural Language Processing Health Information Technology and Health Data Standards at NLM ® Clinical vocabulary standards and tools that support implementation of Meaningful Use, C-CDA, and other programs Clinical vocabulary standards and tools that support implementation of Meaningful Use, C-CDA, and other programs Human Genome Resources Online Mendelian Inheritance in Man ® (OMIM) A guide to genes and inherited disorders. A guide to genes and inherited disorders. Gene Gene integrates information from a wide range of species. A record may include nomenclature, Reference Sequences (RefSeqs), maps, pathways, variations, phenotypes, and links to genome-, phenotype-, and locus-specific resources worldwide. Gene integrates information from a wide range of species. A record may include nomenclature, Reference Sequences (RefSeqs), maps, pathways, variations, phenotypes, and links to genome-, phenotype-, and locus-specific resources worldwide. Genome Data Viewer A genome browser supporting the exploration and analysis of more than 580 eukaryotic RefSeq genome assemblies. A genome browser supporting the exploration and analysis of more than 580 eukaryotic RefSeq genome assemblies. More Human Genome resources at NCBI Health Services Research and Public Health Health Services Research and Public Health Intramural Research NLM ® Intramural Research Program History of Medicine Historical Collections Exhibition Program Historical Collections Copyright Information Policies and Guidelines NIH Public Access Compliance Toolkit Research Reporting Guidelines and Initiatives: By Organization Citing Medicine: the NLM Style Guide for Authors, Editors, and Publishers NLM Web Policies (Privacy and Security ; NLM Social Media Comments Policy ; Copyright) Patron Guide to Copyright and Historical Materials Resources For You For Health Care Professionals Training and Careers Last Reviewed: December 2, 2025