4alpha-hydroxymethyl-stigmasta-7,24(24(1))-dien-3beta-ol + 2 Fe(II)-[cytochrome b5] + O2 + 2 H(+) <=> 4alpha-formyl-stigmasta-7,24(24(1))-dien-3beta-ol + 2 Fe(III)-[cytochrome b5] + 2 H2O
4alpha-hydroxymethyl-stigmasta-7,24(24(1))-dien-3beta-ol + 2 fe(ii)-[cytochrome b5] + o2 + 2 h(+) <=> 4alpha-formyl-stigmasta-7,24(24(1))-dien-3beta-ol + 2 fe(iii)-[cytochrome b5] + 2 h2o