7alpha-hydroxycholesterol + reduced [NADPH--hemoprotein reductase] + O2 <=> (24S)-7alpha-dihydroxycholesterol + oxidized [NADPH--hemoprotein reductase] + H2O + H(+)
7alpha-hydroxycholesterol + reduced [nadph--hemoprotein reductase] + o2 <=> (24s)-7alpha-dihydroxycholesterol + oxidized [nadph--hemoprotein reductase] + h2o + h(+)