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| Description: 1. Formation of a pyrrole ring. 2. Condensation of four pyrrole moieties, giving a cyclic tetrapyrrole. 3. Side chain modifications and ring oxidations. Porphyrias involve abnormal accumulations of heme precursors, either from overproduction of the unnatural type I porphyrins or from abnormally high flux through d-ALA synthetase. Picture Stats: Views: 188 Filesize: 29.24kB Height: 216 Width: 756 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34796 |