label: delta7-sterol 5(6)-desaturase activity
label_lc: delta7-sterol 5(6)-desaturase activity
description: "Catalysis of the reaction: a delta(7)-sterol + 2 ferrocytochrome b5 + O2 + 2 H+ -> a delta(5,7)-sterol + 2 ferricytochrome b5 + 2 H2O."