This is the homepage for NCBI. NCBI is a division of the National Library of Medicine. Check out the Resource List and Popular Sources to find data related to gene and genome sequences, information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data via PubChem, and taxonomy information for over 160,000 organisms.
PubChem provides information on the biological activities of small molecules searchable by compound, substance or bioassay. PubChem includes physical data, drug information, and chemical structure graphics. This database is maintained by the U.S. National Center for Biotechnology Information (NCBI).