Identifies unknown residues in each chain of the given PDB structure.
Identifies all chain IDs in the given PDB structure.
Identifies molecular types in the given PDB structure.
Identifies residue numbers in each chain of the given PDB structure.
Identifies unknown residues in each chain of the given PDB structure.
Reads a text file specified by pdb_f, pads each line to 80 characters
with spaces, and returns a buffered reader over an in-memory buffer
containing the padded content.
Removes lines starting with “REMARK” from a PDB file and returns the filtered content as a BufReader.