tokens: Western and supershift analyses indicated that functional Jun and Fos proteins were present in nuclear extracts of PMA-differentiated U937 cells .
folded_tokens: western and supershift analyses indicated that functional jun and fos proteins were present in nuclear extracts of pma-differentiated u937 cells .
labels: O O O O O O O O O O O O O O B-cell_component I-cell_component O B-cell_line B-cell_line I-cell_line O