8501
The cells used were the BLIN-1 pre-B cell line expressing low levels of cell surface mu heavy chain associated with surrogate light chain and the 1E8 immature B cell line expressing cell surface mu/kappa .
 ( protein: cell surface mu heavy chain, None) , ( protein: surrogate light chain, None) , ( protein: cell surface mu/kappa, None) , ( cell line: BLIN-1 pre-B cell line, 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: cell surface mu heavy chain, None) , ( protein: surrogate light chain, None) , ( protein: cell surface mu/kappa, None) , ( cell line: BLIN-1 pre-B cell line, None) 