Enzyme (EC 1.3.99.5) that converts testosterone to 5\(\upalpha\!\)-dihydrotestosterone in peripheral tissues.
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 799 (https://doi.org/10.1515/pac-2015-1202)