In response to questions about the PDB file format, we have compiled relevant documents at http://www.rcsb.org/pdb/info.html#File_Formats_and_Standards.
The PDB file format is mainly described in the PDB Contents Guide that was released by Brookhaven National Laboratory on December 20, 1996.
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The RCSB has written several documents to accompany the PDB Contents Guide, including a Format FAQ to answer frequently asked questions about the PDB format, and a list of common format errors that have been submitted to the PDB.
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