Whole cell lysates were prepared and subjected to IB analysis using antibodies against SAG (monoclonal antibody raised againt the RING domain (AA44-113), Bax, Bad, cIAP2, (Cell signaling), pRB, Puma, Mcl-1 (Santa Cruz Biotechnology), XIAP, Bcl-XL, p21, (BD Transduction Laboratories), β-Actin (Sigma), Bak (Upstate), Bim (Imgenex), Noxa (Oncogene Science), Bcl-2, (Dako), and survivin (Novus biologicals).