protoporphyrin IX + 3 AH2 => protoporphyrinogen IX + 3 A
protoporphyrin ix + 3 ah2 => protoporphyrinogen ix + 3 a
protoporphyrin IX + 3 AH2 => protoporphyrinogen IX + 3 A
protoporphyrin ix + 3 ah2 => protoporphyrinogen ix + 3 a