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biosynthesis from protoporphyrin IX
chlorophyll biosynthesis (later stages)
EC 1.14.13.81 magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase
EC 1.21.98.3 anaerobic magnesium-protoporphyrin IX monomethyl ester cyclase
EC 2.1.1.11 magnesium protoporphyrin IX methyltransferase