Table 1.
NCBI databases (as of 4 September 2021)
| Database | Records | Description |
|---|---|---|
| Literature | ||
| PubMed | 33 027 761 | Scientific and medical abstracts/citations |
| PubMed Central | 7 325 415 | Full-text journal articles |
| NLM Catalog | 1 629 799 | Index of NLM collections |
| Bookshelf | 892 126 | Books and reports |
| MeSH | 348 370 | Ontology used for PubMed indexing |
| Genomes | ||
| Nucleotide | 476 054 019 | DNA and RNA sequences from GenBank and RefSeq |
| BioSample | 19 473 659 | Descriptions of biological source materials |
| SRA | 15 919 320 | High-throughput DNA/RNA sequence read archive |
| Taxonomy | 2 492 889 | Taxonomic classification and nomenclature catalog |
| Assembly | 1 083 900 | Genome assembly information |
| BioProject | 536 242 | Biological projects providing data to NCBI |
| Genome | 64 815 | Genome sequencing projects by organism |
| BioCollections | 8 468 | Museum, herbaria, and biorepository collections |
| Genes | ||
| GEO Profiles | 128 414 055 | Gene expression and molecular abundance profiles |
| Gene | 33 664 932 | Collected information about gene loci |
| GEO DataSets | 4 784 603 | Functional genomics studies |
| PopSet | 366 935 | Sequence sets from phylogenetic/population studies |
| HomoloGene | 141 268 | Homologous gene sets for selected organisms |
| Clinical | ||
| dbSNP | 1 076 992 604 | Short genetic variations |
| dbVar | 7 117 914 | Genome structural variation studies |
| ClinVar | 1 071 071 | Human variations of clinical significance |
| ClinicalTrials.gov | 388 717 | Registry of clinical studies and results database |
| MedGen | 335 277 | Medical genetics literature and links |
| GTR | 77 498 | Genetic testing registry |
| dbGaP | 1 405 | Genotype/phenotype interaction studies |
| Proteins | ||
| Protein | 968 236 913 | Protein sequences from GenBank and RefSeq |
| Identical Protein Groups | 448 096 579 | Protein sequences grouped by identity |
| Protein Clusters | 1 137 329 | Sequence similarity-based protein clusters |
| Structure | 181 772 | Experimentally-determined biomolecular structures |
| Protein Family Models | 179 133 | Conserved domain architectures, HMMs, and BlastRules |
| Conserved Domains | 62 852 | Conserved protein domains |
| Chemicals | ||
| PubChem Substance | 284 180 803 | Deposited substance and chemical information |
| PubChem Compound | 110 628 849 | Chemical information with structures, information and links |
| PubChem BioAssay | 1 391 308 | Bioactivity screening studies |
| BioSystems | 983 968 | Molecular pathways with links to genes, proteins and chemicals |