单词	haem
释义	haem /hiːm / (US heme) noun [mass noun] Biochemistry An iron-containing compound of the porphyrin class which forms the non-protein part of haemoglobin 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. Origin 1920s: back-formation from haemoglobin.
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