Protein Data Bank
The Protein Data Bank (PDB) is a collection of information about the three dimensional (3-D) structure of large biological molecules, such as proteins and nucleic acids. Biologists and biochemists from around the world send in the data. Most data comes from X-ray crystallography or NMR spectroscopy. Anyone can access the PDB for free online. The Worldwide Protein Data Bank, wwPDB, manages the PDB.