1.3.1.22 3-oxo-5alpha-steroid 4-dehydrogenase (NADP+); cholestenone 5alpha-reductase; testosterone Delta4-5alpha-reductase; steroid 5alpha-reductase; 3-oxosteroid Delta4-dehydrogenase; 5alpha-reductase; steroid 5alpha-hydrogenase; 3-oxosteroid 5alpha-reducta • • •