World English Dictionary
protoporphyrin (ˌprəʊtəʊˈpɔːfɪrɪn)
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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American Heritage
Medical Dictionary

protoporphyrin pro·to·por·phy·rin (prō'tō-pôr'fə-rĭn)
A metal-free porphyrin that combines with iron to form the heme of iron-containing proteins.

The American Heritage® Stedman's Medical Dictionary
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