Published online by Cambridge University Press: 08 February 2018
Cytochrome, an intracellular enzyme widely distributed in all oxygen-using tissues, consists of a mixture of three haemochromogen-like substances referred to as a, b, and c. Of these cytochrome c has been isolated and is available commercially. In living cells cytochrome can be seen spectroscopically to be undergoing alternate oxidation and reduction. It plays an important part in tissue respiration, the respiratory activity of a cell being indeed proportional to its cytochrome content.
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