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Scope Note:

group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration to which a variety of side chains are attached; the nature of the side chain is indicated by a prefix, as uroporphyrin, hematoporphyrin, etc; the porphyrins, in combination with iron, form the heme component in biologically significant compounds such as hemoglobin and myoglobin.

Term Number:

2386-3893