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Subcomplexes of CcO. Three subcomplexes of CcO were observed by native MS in DM detergent. The complex of approximately 76 kDa (red) corresponds to the I–IV subcomplex. Due to similar masses of the protein subunits the 98-kDa complex (blue) could not be unambiguously assigned. A high-mass complex of 157 kDa (green) corresponds to the intact CcO monomer that lost several peripheral subunits.
