pro·to·por·phy·rin (pr  t-pôr f -r n)n. A metal-free porphyrin, C32H32N4(COOH)2, that combines with ferrous iron to form the heme group in hemoglobin and myoglobin, and with ferric iron to form the hemin group in catalase and some cytochromes. |
protoporphyrin [ˌprəʊtəʊˈpɔːfɪrɪn]
n
(Life Sciences & Allied Applications / Biochemistry) a type of porphyrin that, when combined with an iron atom, forms haem, the oxygen-bearing prosthetic group of the red blood pigment haemoglobin
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