Panel A: B35 cells overexpressing the HcrtR2 were cultured in the presence and absence of TNF-α cytokine (2 ng/ml) for 6 hours at 37°C. Cells were lysed, and equivalent amount of whole cell detergent lysates were immunoprecipitated (IP) by anti-HcrtR2 IgG, followed by Western blot analysis with the indicated antibodies. Panel B: B35 cells constitutively expressing the HcrtR2 were transfection with siRNA directed toward cIAP-1 or/and cIAP-2 as described in Materials and Methods 2.4, then cultured in the presence and absence of TNF-α cytokine (2 ng/ml) for 24 hours at 37°C. Cells were harvested, and equivalent amount of whole cell detergent lysates were Western blotted with the indicated antibodies. Experiment was repeated three times, and representative images are shown.