National Library of Medicine
Extensive collection of online information for the public and health care professionals dealing with clinical care, toxicology and environmental health, and basic research.
National Center for Biotechnology Information (NCBI)
Resource for molecular biology information. Creates public databases, conducts research in computational biology, develops software tools for analyzing genome data, and disseminates biomedical information.
Integrates information from NCBI databases including nucleotide and protein sequences, macromolecular structures, whole genomes, and MEDLINE. Allows personalized search.