9788
CD40 ligation leads to B cell activation events such as proliferation , Ig secretion , isotype switching , and up-regulation of cell surface molecules , as well as the generation of memory B cells .
 ( protein: CD40, None) , ( cell type: memory B cells, None) , ( protein: cell surface molecules, 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, None) , ( cell type: memory B cells, None) , ( protein: cell surface molecules, None) 