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uroporphyrinogen decarboxylase This model represents uroporphyrinogen decarboxylase (HemE), which converts uroporphyrinogen III to coproporphyrinogen III. This step takes the pathway toward protoporphyrin IX, a common precursor of both heme and chlorophyll, rather than toward precorrin 2 and its products. [Biosynthesis of cofactors, prosthetic groups, and carriers, Heme, porphyrin, and cobalamin]
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