12915
The chemokine receptor , BLR1 , is a major regulator of the microenvironmental homing of B cells in lymphoid organs .
 ( protein: chemokine receptor, None) , ( cell type: B cells, None) , ( protein: BLR1, 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: chemokine receptor, None) , ( cell type: B cells, None) , ( protein: BLR1, None) 