code: def str_fmthdr(self, goid, goobj):
          
          # Shorten: Ex: GO:0007608 -> G0007608
          go_txt = goid.replace("GO:", "G")
          if 'mark_alt_id' in self.present and goid != goobj.id:
              go_txt += 'a'
          return go_txt
docs: Return hdr line seen inside a GO Term box.