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. 2005 Apr 11;102(16):5886–5891. doi: 10.1073/pnas.0501784102

Fig. 1.

Fig. 1.

The cyclase catalyses the conversion of MPE to protochlorophyllide. In nature, an aerobic and an anaerobic pathway exist. In the aerobic reaction, NADPH is the cofactor used as an electron donor in the reaction and molecular oxygen is incorporated into protochlorophyllide.