¹ Source: wiktionary.com
Medical Definition of Uroporphyrinogens
1. Porphyrinogens which are intermediates in haem 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. (12 Dec 1998)