13409
BCL-6 (-)/ syn-1 (+) tumor cells of CHD are mostly found surrounded by T cells expressing CD40L , consistent with the observation that CD40 signaling downregulates BCL-6 expression .
 ( protein: syn-1, None) , ( protein: CD40L, None) , ( cell type: tumor cells, None) , ( cell line: BCL-6 (-)/ syn-1 (+) tumor cells, None) , ( protein: BCL-6, None) , ( protein: BCL-6, None) , ( cell type: T cells, None) , ( protein: CD40, 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: syn-1, None) , ( protein: CD40L, None) , ( cell type: tumor cells, None) , ( cell line: BCL-6 (-)/ syn-1 (+) tumor cells, None) , ( protein: BCL-6, None) , ( protein: BCL-6, None) , ( cell type: T cells, None) , ( protein: CD40, None) 