Here are instructions in case you run into trouble. They will help you avoid common mistakes, such as uploading a file with only one chain, files with odd naming conventions, or files that contain non-amino/nucleic acid groups in ATOM records.

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Use Original KFC
Note: You may leave the chain identifiers blank if your PDB file contains a complex of exactly two chains separated by a TER record. Do not upload structures containing only a single chain, as this will return an error.
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