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Biology; Chemistry and Chemical Engineering; Medicine
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Entrez searches the National Center for Biotechnology Information (NCBI) databases to provide integrated access to nucleotide and protein sequence data from over 160,000 species, along with three-dimensional protein structures, genomic mapping information, PubMed MEDLINE, and more. Sequence data are combined from various sources, including GenBank, EMBL, DDBJ, RefSeq, PIR-International, PRF, Swiss-Prot, and PDB. Entrez can be searched with a wide variety of text terms such as author name, journal name, gene or protein name, organism, unique identifier (e.g., accession number, sequence ID, PubMed ID), and other terms, depending on the database being searched.
Database topics
Chemistry and Chemical Engineering; Biology; Medicine; Toxicology and Chemical Safety; General and Reference Works
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PubMed is an index to over 5,000 journals in medicine, nursing, dentistry, veterinary medicine, the health care system, and the preclinical sciences, including both basic biomedical sciences and clinical practice. Medical Subject Headings (MeSH) provide a powerful tool for searching topics. Updated daily, covers 1946--present, with some older material.