Overexpression of Bcl-2 in tumor cells blocks apoptosis induced by many stimuli , but inhibition of Fas -mediated killing has not been consistently observed .
overexpression of bcl-2 in tumor cells blocks apoptosis induced by many stimuli , but inhibition of fas -mediated killing has not been consistently observed .
O O B-protein_molecule O B-cell_type I-cell_type O O O O O O O O O O B-protein_molecule O O O O O O O O