8704
When immunoglobulin ( Ig ) expressing B cells are fused with non-B cells , Ig expression is rapidly suppressed at the level of transcription, a phenomenon termed extinction .
 ( protein: Ig, None) , ( cell type: non-B cells, None) , ( cell type: immunoglobulin ( Ig ) expressing B cells, None) , ( protein: immunoglobulin, None) , ( cell type: B 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:
 ( protein: Ig, None) , ( cell type: non-B cells, None) , ( cell type: immunoglobulin ( Ig ) expressing B cells, None) , ( protein: immunoglobulin, None) , ( cell type: B cells, None) 