An iron-containing compound of the porphyrin class that forms the nonprotein part of hemoglobin and some other biological molecules.
- This turnover releases significant amounts of the iron-free portion of heme, porphyrin, which is subsequently degraded.
- The majority of photosensitizers are derivatives of hematoporphyrin, a synthetic porphyrin synthesized from heme.
- The active site or prosthetic group of all the cytochromes is an iron containing porphyrin, or heme.
1920s: back-formation from hemoglobin.
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