Reaction catalyzed by DELTA24-sterol reductase (1.3.1.72)
+
NADPH
=
+
NADP+
4,4-dimethyl-5alpha-cholesta-8,24-dien-3beta-ol
+
NADPH
=
4,4-dimethyl-5alpha-cholesta-8-en-3beta-ol
+
NADP+