def get_tx_identity_info(self, tx_ac):
rows = self._fetchall(self._queries['<STR_LIT>'], [tx_ac])<EOL>if len(rows) == <NUM_LIT:0>:<EOL><INDENT>raise HGVSDataNotAvailableError(<EOL>"<STR_LIT>".format(tx_ac=tx_ac))<EOL><DEDENT>return rows[<NUM_LIT:0>]<EOL>
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