Reaction catalyzed by 3-oxo-5alpha-steroid 4-dehydrogenase (acceptor) (1.3.99.5)

		+		oxidized dichlorophenolindophenol	=			+
	(5alpha)-androst-1-en-3,17-dione	+		oxidized dichlorophenolindophenol	=		1,4-androstadiene-3,17-dione	+		reduced dichlorophenolindophenol