code: def parse_prefix(identifier):
      
      pf, id = (), identifier
      if "|" in identifier:
          pf, id = tuple(identifier.split('|')[:-1]), identifier.split('|')[-1]
  
      return pf, id
docs: Parse identifier such as a|c|le|d|li|re|or|AT4G00480.1 and return
      tuple of prefix string (separated at '|') and suffix (AGI identifier)