1.14.99.4 progesterone + reduced acceptor + O2 = testosterone acetate + acceptor + H2O Has a wide specificity. A single enzyme from Cylindrocarpon radicicola (EC1.14.13.54 ketosteroid monooxygenase) catalyses both this reaction and that catalysed by EC1.14.99.12 4-androstene-3,17-dione monooxygenase -