protoporphyrin

/ (ˌprəʊtəʊˈpɔːfɪrɪn) /

noun

a type of porphyrin that, when combined with an iron atom, forms haem, the oxygen-bearing prosthetic group of the red blood pigment haemoglobin

Medical definitions for protoporphyrin

protoporphyrin
[ prō′tō-pôrfə-rĭn ]

n.

A metal-free porphyrin that combines with iron to form the heme of iron-containing proteins.