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

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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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.