Protoporphyrin Definition

prōtō-pôrfə-rĭn
noun
A metal-free porphyrin, C34 H34 N4 O4 , 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.
American Heritage Medicine

(biochemistry) Any porphyrin that lacks a central metal ion.

Wiktionary

Other Word Forms of Protoporphyrin

Noun

Singular:
protoporphyrin
Plural:
protoporphyrins

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protoporphyrin