Reaction catalyzed by DELTA7-sterol 5(6)-desaturase (1.14.19.20)
+
+
+
=
+
+
H2O
cholest-7-en-3beta-ol
+
ferrocytochrome b5
+
O2
+
H+
=
cholest-5,7-dien-3beta-ol
+
ferricytochrome b5
+
H2O
