. "The enzyme is highly specific for ADP-ribose 1''-phosphate." . "Involved together with EC 3.1.4.37 in the breakdown of adenosine diphosphate ribose 1'',2''-cyclic phosphate (Appr>p), a by-product of tRNA splicing." . . . "ADP-ribose 1''-phosphate phosphatase" . "Appr1p phosphatase" . . "ADP-ribose 1''-phosphate + H(2)O = ADP-ribose + phosphate." .