Table 1.
The Entrez Databases (as of 9 September 2020)
| Database | Records | Description |
|---|---|---|
| Literature | ||
| PubMed | 31 471 600 | scientific and medical abstracts/citations |
| PubMed Central | 6 447 271 | full-text journal articles |
| NLM catalog | 1 619 856 | index of NLM collections |
| Books | 825 385 | books and reports |
| MeSH | 300 500 | ontology used for PubMed indexing |
| Genomes | ||
| Nucleotide | 429 731 711 | DNA and RNA sequences |
| BioSample | 14 628 076 | descriptions of biological source materials |
| SRA | 11 807 161 | high-throughput DNA and RNA sequence read archive |
| Taxonomy | 2 401 136 | taxonomic classification and nomenclature catalog |
| Assembly | 837 406 | genome assembly information |
| BioProject | 458 893 | biological projects providing data to NCBI |
| Genome | 55 580 | genome sequencing projects by organism |
| BioCollections | 8 138 | museum, herbaria and other biorepository collections |
| Genes | ||
| GEO Profiles | 128 414 055 | gene expression and molecular abundance profiles |
| Gene | 28 377 759 | collected information about gene loci |
| GEO datasets | 4 002 373 | functional genomics studies |
| PopSet | 350 627 | sequence sets from phylogenetic and population studies |
| HomoloGene | 141 268 | homologous gene sets for selected organisms |
| Genetics | ||
| SNP | 720 643 623 | short genetic variations |
| dbVar | 6 030 887 | genome structural variation studies |
| ClinVar | 845 008 | human variations of clinical significance |
| MedGen | 335 277 | medical genetics literature and links |
| GTR | 76 814 | genetic testing registry |
| dbGaP | 1 397 | genotype/phenotype interaction studies |
| Proteins | ||
| Protein | 874 272 642 | protein sequences |
| Identical protein groups | 329 946 078 | protein sequences grouped by identity |
| Protein clusters | 1 137 329 | sequence similarity-based protein clusters |
| Structure | 167 650 | experimentally-determined biomolecular structures |
| Sparcle | 149 462 | conserved domain architectures |
| Conserved domains | 59 951 | conserved protein domains |
| Chemicals | ||
| PubChem substance | 285 048 146 | deposited substance and chemical information |
| PubChem compound | 111 325 418 | chemical information with structures, information and links |
| PubChem BioAssay | 1 229 071 | bioactivity screening studies |
| BioSystems | 983 968 | molecular pathways with links to genes, proteins and chemicals |