delta7-sterol 5(6)-desaturase activity
delta7-sterol 5(6)-desaturase activity
Catalysis of the reaction: a Delta(7)-sterol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H+ = a Delta(5),Delta(7)-sterol + 2 Fe(III)-[cytochrome b5] + 2 H2O.