?:definition
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Catalysis of the reaction: coproporphyrinogen III + 2 H(+) + O(2) = 2 CO(2) + 2 H(2)O + protoporphyrinogen IX. [EC:1.3.3.3, RHEA:18257]
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Catalysis of the reaction: coproporphyrinogen III + 2 S-adenosyl-L-methionine = protoporphyrinogen IX + 2 CO2 + 2 L-methionine + 2 5\'-deoxyadenosine. [EC:1.3.98.3]
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