tokens: Notably , the lack of pRB in these U937-derived clones renders these p53-null cells highly resistant to apoptosis induced by serum withdrawal , calphostin C , and ceramide .
folded_tokens: notably , the lack of prb in these u937-derived clones renders these p53-null cells highly resistant to apoptosis induced by serum withdrawal , calphostin c , and ceramide .
labels: O O O O O B-protein_molecule O O B-cell_line I-cell_line O O B-cell_line I-cell_line O O O B-other_name O O B-other_name I-other_name O B-other_organic_compound I-other_organic_compound O O B-other_organic_compound O