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Cytochromes

Heme-containing proteins that serve as electron carriers.

Iron-porphyrin proteins that transfer electrons by iron's reversible Fe2+/Fe3+ cycling. Components of the electron transport chain (cytochromes b, c, c1, a, a3) and the cytochrome P450 system that metabolizes xenobiotics.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Iron-porphyrin proteins that transfer electrons by iron's reversible Fe2+/Fe3+ cycling. Components of the electron transport chain (cytochromes b, c, c1, a, a3) and the cytochrome P450 system that metabolizes xenobiotics.

Related terms

Electron transport chain, Oxidative phosphorylation