tokens: The effect of the pRB posttranslational modification during apoptosis was investigated by determining the E2F-1 levels and by isolating and characterizing pRB -null clones from U937 cells .
folded_tokens: the effect of the prb posttranslational modification during apoptosis was investigated by determining the e2f-1 levels and by isolating and characterizing prb -null clones from u937 cells .
labels: O O O O B-protein_molecule O O O B-other_name O O O O O B-protein_molecule O O O O O O B-protein_molecule O O O B-cell_line I-cell_line O