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Chemical steps in heme degradation as defined by the studies of eukaryotic heme oxygenases and C. diphtheriae HmuO. Me, methyl side chain; V, vinyl side chain; Pr, propionic side chain. All thus far characterized heme oxygenases cleave the porphyrin ring at the α-carbon atom, whereas PigA(HO) cleaves at the β-carbon.
