ReviewBiomolecules2026
Oxidation of Uroporphyrinogens During Heme Synthesis: Role of Iron, Susceptibility and Consequences.
Review in Biomolecules, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Abstract
In the biosynthesis of heme the tetrapyrrole hydroxymethylbilane is converted enzymatically to uroporphyrinogen III whereas conversion to uroporphyrinogen I occurs spontaneously. Both are substrates for uroporphyrinogen decarboxylase (UROD) but only the III isomer is a precursor of heme. These porphyrinogens are easily oxidised to the respective uroporphyrins and trace amounts occur in the urine of healthy humans and animals. Large quantities of uroporphyrins I and III, as well as other oxidation products, occur in the liver and urine of patients with some porphyrias and after poisoning of people and animals by chemicals, such as hexachlorobenzene (HCB) and 2,3,7,8-tetrachorodibenzo-
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