3-Oxo-5-Alpha-Steroid 4-Dehydrogenase 1

**Semantic type:** Amino Acid, Peptide, or Protein|Enzyme

**Definition:** 3-oxo-5-alpha-steroid 4-dehydrogenase 1 (259 aa, ~29 kDa) is encoded by the human SRD5A1 gene. This protein is involved in sexual differentiation and androgen physiology.

**Synonyms:** - 3-Oxo-5 Alpha-Steroid Delta 4-Dehydrogenase Alpha 1 - 5-Alpha Reductase - EC 1.3.1.30 - EC 1.3.99.5 - SR Type 1 - SRD5A1 - Steroid 5-Alpha-Reductase 1 - Steroid 5-Alpha-Reductase Type I