NCBI’s primary text search and retrieval system that integrates the PubMed database of biomedical literature with 39 other literature and molecular databases including DNA and protein sequence, structure, gene, genome, genetic variation and gene expression.
Entrez’ 40 databases are organized into three sections on the Global Query page. The top section contains the literature databases: PubMed, PubMed Central, Books, OMIM and OMIA. The 26 molecular databases occupy the largest central section of the page. The bottom section hosts the accessory literature databases Journals, MeSH, and NLM Catalog.