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protoporphyrin

/ (ˌprəʊtəʊˈpɔːfɪrɪn) /
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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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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.
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