5121
Stimulation of mouse B cells with anti- IgM or IgD antibodies , bacterial lipopolysaccharide , phorbol 12-myristate 13-acetate plus ionomycin , or CD40 ligand led to a five-fold to 35-fold decrease in BCL-6 mRNA levels .
 ( protein: CD40 ligand, None) , ( cell type: mouse B cells, None) , ( RNA: BCL-6 mRNA, 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: CD40 ligand, None) , ( cell type: mouse B cells, None) , ( RNA: BCL-6 mRNA, None) 