calcitetrol + 2 oxidized [adrenodoxin] + H2O => secalciferol + 2 reduced [adrenodoxin] + O2 + 2 H(+)
calcitetrol + 2 oxidized [adrenodoxin] + h2o => secalciferol + 2 reduced [adrenodoxin] + o2 + 2 h(+)