1820
EL-4 cells also produce low levels of IL-5 when stimulated by PMA alone; however, cAMP greatly augments PMA -dependent IL-5 production .
 ( cell line: EL-4 cells, None) , ( protein: IL-5, None) , ( protein: IL-5, 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:
 ( cell line: EL-4 cells, None) , ( protein: IL-5, None) , ( protein: IL-5, None) 