(biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)
"Scientists discovered that a mutated cytochrome was blocking the electron transport chain, which severely hampered the cell's ability to generate energy."
Any of various related hemoproteins found in the cells of most organisms, which are an important part of cell respiration.
"The scientist explained that a malfunctioning cytochrome could halt the entire process of cellular respiration within the mitochondria."