5alpha-cholesta-7,24-dien-3beta-ol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) <=> 7-dehydrodesmosterol + 2 Fe(III)-[cytochrome b5] + 2 H2O
5alpha-cholesta-7,24-dien-3beta-ol + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) <=> 7-dehydrodesmosterol + 2 fe(iii)-[cytochrome b5] + 2 h2o
5alpha-cholesta-7,24-dien-3beta-ol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) <=> 7-dehydrodesmosterol + 2 Fe(III)-[cytochrome b5] + 2 H2O
5alpha-cholesta-7,24-dien-3beta-ol + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) <=> 7-dehydrodesmosterol + 2 fe(iii)-[cytochrome b5] + 2 h2o