tokens: When mouse MPC11 plasmacytoma cells , in which the IgH 3' enhancer is active , are fused with fibroblasts , Ig expression is extinguished at the level of transcription .
folded_tokens: when mouse mpc11 plasmacytoma cells , in which the igh 3' enhancer is active , are fused with fibroblasts , ig expression is extinguished at the level of transcription .
labels: O B-cell_line I-cell_line I-cell_line I-cell_line O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-cell_type O B-other_name I-other_name O O O O O O O O