PubMed is a database of the U.S. National Library of Medicine (NLM) and the National Institutes of Health. It has been developed by the National Center for Biotechnolgy Information at the NLM, and is available free online. PubMed has approximately 19 million citations.

Free access to 700+ texts in life science and healthcare. Users can browse, retrieve, and read content. Provided by
the U.S. National Library of Medicine and National Institutes of Health.

For an all day free training session on searching within PubMed contact the National Network of Libraries of Medicine National Center and Clearinghouse (NTCC).

In addition to the National Academy of Sciences, this site includes information about the National Academy of Engineering, the Institute of Medicine, and the National Research Council. Overall, the site has scientific information on topics including the physical sciences, life and earth sciences, medicine and health, education and science and technology policy.

The Protein Databank (PDB) is an archive of experimentally determined 3-dimensional structures of biological macromolecules, serving a global community of researchers, educators, and students.

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