code: def parse_seqres(self, pdb):
      
      
      seqresre = re.compile("SEQRES")
      
      seqreslines = [line for line in pdb.lines if seqresre.match(line)]
      
      for line in seqreslines:
        chain = line[11]
        resnames = line[19:70].strip()
        self.setdefault(chain, [])
        self[chain] += resnames.split()
docs: Parse the SEQRES entries into the object