code: def _get_node_text(self, goid, goobj):
          
          txt = []
          # Header line: "GO:0036464 L04 D06"
          txt.append(self.pltvars.fmthdr.format(
              GO=goobj.id.replace("GO:", "GO"),
              level=goobj.level,
              depth=goobj.depth))
          # GO name line: "cytoplamic ribonucleoprotein"
          name = goobj.name.replace(",", "\n")
          txt.append(name)
          # study info line: "24 genes"
          study_txt = self._get_study_txt(goid)
          if study_txt is not None:
              txt.append(study_txt)
          # return text string
          return "\n".join(txt)
docs: Return a string to be printed in a GO term box.