Reaction catalyzed by DELTA7-sterol 5(6)-desaturase (1.14.19.20)
+
+
+
=
+
ferricyctochrome b5
+
H2O
ergosta-8,22-dien-3beta-ol
+
ferrocytochrome b5
+
O2
+
H+
=
ergosta-5,8,22-trien-3beta-ol
+
ferricyctochrome b5
+
H2O
