Reaction catalyzed by DELTA4-3-oxosteroid 5beta-reductase (1.3.1.3)

		+		NADPH	=			+		NADP+
	7alpha,12alpha-dihydroxy-4-cholesten-3-one	+		NADPH	=		7alpha,12alpha-dihydroxy-5-beta-cholestan-3-one	+		NADP+