Uroporphyrinogens

**Definition:** Porphyrinogens which are intermediates in heme biosynthesis. They have four acetic acid and four propionic acid side chains attached to the pyrrole rings. Uroporphyrinogen I and III are formed from polypyrryl methane in the presence of uroporphyrinogen III cosynthetase and uroporphyrin I synthetase, respectively. They can yield uroporphyrins by autooxidation or coproporphyrinogens by decarboxylation.

**Tree numbers:** - D03.383.129.578.840.500.700.900 - D03.633.400.909.500.700.900 - D04.345.783.500.700.900