(C) BAX/BAK-deficient HeLa cells ectopically expressing BAX and Parkin were treated with antimycin A and oligomycin (AO, 3 h), MG132 (20 µM, 3.5 h) and BH3 mimetics (1 µM of each of ABT-737 and S63485, 1 h). Cytosol and membrane fractions were immunoblotted as indicated. Graph shows densitometric analysis of non-ubiquitinated membrane proteins (top, relative to untreated control) or cytochrome c release (bottom; cytosol/cytosol+membrane, relative to untreated controls) from three independent experiments. Error bars represent mean +/- SD. 