(B) 2D-BN/SDS-PAGE analysis from control (143B) and COX2Δ cybrids followed by immunoblotting with the indicated antibodies. I+III2+IV1, SC containing CI, CIII, and CIV; I+III2plus, SC containing CI, CIII and a COX1-submodule; III2+IV, SC containing CIII and CIV; IV2, CIV dimer; IV, CIV monomer. The presence of a COX1-CMC1-COA3-containing subcomplex is indicated. 