Reaction catalyzed by 7alpha-hydroxysteroid dehydrogenase (1.1.1.159)

		+		NAD(P)+	=			+		NAD(P)H
	glycochenodeoxycholic acid	+		NAD(P)+	=		N-[3alpha-hydroxy-7,24-dioxocholan-24-yl]glycine	+		NAD(P)H