protoporphyrin is a topic covered in the Taber's Medical Dictionary.

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(prōt″ō-por′fĭ-rĭn )

[proto- + porphyrin]
A derivative of hemoglobin containing four pyrrole nuclei; C34H34N4O4. It occurs naturally and is formed from heme (ferriprotoporphyrin) by deletion of an atom of iron.

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