Various whole cell extracts (30 μg) were separated by 10% SDS-PAGE, and the membranes were blotted with PP2A alpha + PP2A beta antibody (GTX133710) diluted at 1:1000 and competitor's antibody (sc-14020) diluted at 1:100. The HRP-conjugated anti-rabbit IgG antibody (GTX213110-01) was used to detect the primary antibody.