The RCSB Protein Data Bank
The Brookhaven Protein Data Bank (PDB) is operated by Rutgers, The State University of New Jersey; the San Diego Supercomputer Center at the University of California, San Diego; and the National Institute of Standards and Technology -- three members of the Research Collaboratory for Structural Bioinformatics (RCSB). The PDB is supported by funds from the National Science Foundation, the Department of Energy, and two units of the National Institutes of Health: the National Institute of General Medical Sciences and the National Library of Medicine.
http://www.rcsb.org
This database contains entries for molecular sequences, whose structure has been experimentally determined by X-ray crystallography or nucleic magnetic resonance imaging (NMR, MRI). The images presented have been experimentally acquired, and are not theoretical.