Pronunciation: (sī'tu-krōm"), Strict Standards: Non-static method FenSites::linkTo() should not be called statically in /site/html/dictionary/cytochrome.html on line 73 [key]
any of several carrier molecules in the mitochondria of plant and animal cells, consisting of a protein and an iron-containing porphyrin ring and participating in the stepwise transfer of electrons in oxidation reactions: each cytochrome alternately accepts and releases an electron at a slightly lower energy level in the order designated b, c1, c, a, and a3. Cf. electron transport.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.