8498
The B cell-specific cell surface molecule CD19 is expressed at all stages of B cell development , including normal plasma cells, and mediates signal transduction via interaction with cytoplasmic effector proteins .
 ( protein: B cell-specific cell surface molecule, None) , ( protein: cytoplasmic effector proteins, None) , ( protein: CD19, 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: B cell-specific cell surface molecule, None) , ( protein: cytoplasmic effector proteins, None) , ( protein: CD19, None) 