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Cytochrome

• a class of hemoprotein found in mitochondria that transport electron or protons(e.g. Hydrogen ions)(for instance during cell respiration or photosynthesis)

• cytochromes are found in the mitochondrial inner membrane of eukaryotes, in the chloroplasts of plants, in photosynthetic microorganisms, as well as in bacteria

• the "chrome" means color through which they are divided into groups based on their ability to absorb or transmit certain colors of light.