ID 1.3.99.6 DE 3-oxo-5-beta-steroid 4-dehydrogenase. AN Delta(4)-3-ketosteroid 5-beta-reductase. CA A 3-oxo-5-beta-steroid + acceptor = a 3-oxo-Delta(4)-steroid + reduced CA acceptor. PR PROSITE; PDOC00061; //