(4Z,15Z)-bilirubin IXalpha + 4 AH2 => urobilinogen + 4 A
(4z,15z)-bilirubin ixalpha + 4 ah2 => urobilinogen + 4 a
(4Z,15Z)-bilirubin IXalpha + 4 AH2 => urobilinogen + 4 A
(4z,15z)-bilirubin ixalpha + 4 ah2 => urobilinogen + 4 a