Claim: SRD5A1 is an enzyme that in humans is encoded by the SRD5A1 gene and is one of three forms of steroid 5a-reductase.
Evidence: 3-oxo-5α-steroid 4-dehydrogenase 1 is an enzyme that in humans is encoded by the SRD5A1 gene. It is one of three forms of steroid 5α-reductase.