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Uroporphyrinogens are tetrapyrroles with four propionic acid groups and four acetic acid groups.
In the synthesis of porphyrin, "Uroporphyrinogen III" is created by the enzyme Uroporphyrinogen III synthase, and the enzyme Uroporphyrinogen III decarboxylase converts it into coproporphyrinogen III.
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"Uroporphyrinogens"