= Cytochrome c
An <electron carrier> <protein> in the <mitochondrial respiratory chain>.
It carries <electrons> between respiratory complexes through reversible changes in its heme iron. Its release from the <mitochondrial intermembrane space> also contributes to <apoptosis> in many <animal> <cells>, illustrating distinct functions determined by location. <Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapters 3, 6 and 15, protein function, translation and cell signalling]{ref}
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