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Pyrrol structure a) in heme proteins and b-d) in identified pyrrole structures in sulfheme derivatives of myoglobin. Sulfur incorporation into the porphyrin frame by the saturation of the Cβ – Cβ bond in one of the pyrrole ring results in the formation of chlorin-type structures such as b) episulfide; c) ring opened episulfide or d) thiochlorin isoforms [91].
