1.3.7.4 additional information - additional information sub-micromolar Km for biliverdin IXa 437768 1.3.7.4 0.0012 - reduced ferredoxin Porphyra umbilicalis ferredoxin 437768 1.3.7.4 0.0035 - reduced ferredoxin Spinacia oleracea ferredoxin 437768