Immunoblot analysis of the TCL of HeLa cells stably transfected with the indicated vectors and treated with MG132 as indicated.   Quantification of the results from panels (D) and (E). 3 replicates were analyzed using Student's 2-tailed t-test and are presented as the means ± SEM. * p<0.05, ** p<0.01, *** p<0.001.   