code: def get_tx_identity_info(self, tx_ac):
          
          rows = self._fetchall(self._queries['tx_identity_info'], [tx_ac])
          if len(rows) == 0:
              raise HGVSDataNotAvailableError(
                  "No transcript definition for (tx_ac={tx_ac})".format(tx_ac=tx_ac))
          return rows[0]
docs: returns features associated with a single transcript.
  
          :param tx_ac: transcript accession with version (e.g., 'NM_199425.2')
          :type tx_ac: str
  
          # database output
          -[ RECORD 1 ]--+-------------
          tx_ac          | NM_199425.2
          alt_ac         | NM_199425.2
          alt_aln_method | transcript
          cds_start_i    | 283
          cds_end_i      | 1003
          lengths        | {707,79,410}
          hgnc           | VSX1