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Related to protoporphyrin: Zinc Protoporphyrin
a porphyrin whose iron complex united with protein occurs in hemoglobin, myoglobin, and certain respiratory pigments. It is accumulated and excreted excessively in the feces in erythropoietic protoporphyria and variegate porphyria.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
A metal-free porphyrin, C34H34N4O4, 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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
protoporphyrinA porphyrin occurring in the course of the synthesis of HAEMOGLOBIN. Excess of this porphyrin, protoporphyria, causes intense itching, swelling and redness of the skin on exposure to sunlight and leads to a strikingly weatherbeaten appearance.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
A precursor molecule to the porphyrin molecule.
Mentioned in: Porphyrias
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.