the combination of the optical and x-ray absorption techniques has afforded a deconvolution of the four species of copper in the various states of cytochrome c oxidase and the tentative assignment of cu alpha , the copper redox coupled to the heme alpha of cytochrome alpha , as a highly covalent type of copper and cu alpha 3 , the copper of cytochrome alpha 3 , as a more ionic 'blue ' type i copper .
C0030012
redox
C0010798
cytochrome