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Cytochrome
redox active proteins containing a heme with a Fe atom as a cofactor / From Wikipedia, the free encyclopedia
Cytochromes are haemoproteins (or proteins containing haem groups). They make ATP by electron transport.
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They are found either as single (monomeric) proteins (e.g., cytochrome c) or as part of bigger enzyme complexes which catalyze redox reactions.
The haem group does the redox reactions. These include all chemical reactions in which atoms have their oxidation state changed. In general, redox reactions involve the transfer of electrons.