| Db | Count | Description |
|---|---|---|
| Books | books and reports | |
| MeSH | ontology used for PubMed indexing | |
| NLM Catalog | books, journals and more in the NLM Collections | |
| PubMed | scientific & medical abstracts/citations | |
| PubMed Central | full-text journal articles |
| Db | Count | Description |
|---|---|---|
| EST | expressed sequence tag sequences | |
| Gene | collected information about gene loci | |
| GEO DataSets | functional genomics studies | |
| GEO Profiles | gene expression and molecular abundance profiles | |
| HomoloGene | homologous gene sets for selected organisms | |
| PopSet | sequence sets from phylogenetic and population studies | |
| UniGene | clusters of expressed transcripts |
| Db | Count | Description |
|---|---|---|
| ClinVar | human variations of clinical significance | |
| dbGaP | genotype/phenotype interaction studies | |
| GTR | genetic testing registry | |
| MedGen | medical genetics literature and links | |
| OMIM | online mendelian inheritance in man | |
| PubMed Health | clinical effectiveness, disease and drug reports |
| Db | Count | Description |
|---|---|---|
| Conserved Domains | conserved protein domains | |
| Protein | protein sequences | |
| Protein Clusters | sequence similarity-based protein clusters | |
| Structure | experimentally-determined biomolecular structures |
| Db | Count | Description |
|---|---|---|
| Assembly | genome assembly information | |
| BioProject | biological projects providing data to NCBI | |
| BioSample | descriptions of biological source materials | |
| Clone | genomic and cDNA clones | |
| dbVar | genome structural variation studies | |
| Genome | genome sequencing projects by organism | |
| GSS | genome survey sequences | |
| Nucleotide | DNA and RNA sequences | |
| Probe | sequence-based probes and primers | |
| SNP | short genetic variations | |
| SRA | high-throughput DNA and RNA sequence read archive | |
| Taxonomy | taxonomic classification and nomenclature catalog |
| Db | Count | Description |
|---|---|---|
| BioSystems | molecular pathways with links to genes, proteins and chemicals | |
| PubChem BioAssay | bioactivity screening studies | |
| PubChem Compound | chemical information with structures, information and links | |
| PubChem Substance | deposited substance and chemical information |