11863
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.
 ( cell type: fibroblasts, None) , ( DNA: IgH 3#$%# enhancer, None) , ( cell line: mouse MPC11 plasmacytoma cells, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell type: fibroblasts, None) , ( DNA: IgH 3#$%# enhancer, None) , ( cell line: mouse MPC11 plasmacytoma cells, None) 