3-oxo-5-alpha-steroid 4-dehydrogenase activity https://github.com/geneontology/go-ontology/issues/26703 https://github.com/geneontology/go-ontology/issues/28199 https://github.com/geneontology/go-ontology/issues/30193 Reactome:R-HSA-469659 3-oxo-5alpha-steroid delta4-dehydrogenase activity steroid 5 alpha reductase 3-oxo-5alpha-steroid 4-dehydrogenase activity 3-oxosteroid delta4-dehydrogenase delta4-3-ketosteroid5alpha-oxidoreductase activity 3-oxo-5alpha-steroid:acceptor delta4-oxidoreductase activity 3-oxo-5alpha-steroid:(acceptor) delta4-oxidoreductase activity 5alpha-reductase testosterone 5alpha-reductase GO:0003865 Catalysis of the reaction: a 3-oxo-5-alpha-steroid + acceptor = a 3-oxo-delta(4)-steroid + reduced acceptor. 3-keto-delta4-steroid-5alpha-reductase activity 4-ene-3-ketosteroid-5alpha-oxidoreductase activity delta4-3-oxo steroid reductase activity steroid 5-alpha-reductase activity RHEA:51048 MetaCyc:RXN-13682 delta4-3-keto steroid 5alpha-reductase activity RHEA:13805 Reactome:R-HSA-9705713 delta4-5alpha-dehydrogenase activity EC:1.3.99.5 delta4-3-oxosteroid-5alpha-reductase steroid 5alpha-reductase Reactome:R-HSA-9705714 RHEA:51060 steroid delta4-5alpha-reductase activity molecular_function steroid dehydrogenase activity, acting on the CH-CH group of donors