13310
LNCaP cells treated with prostaglandin E2 showed neither a reduction in proliferation nor a down-regulation of AR and PSA levels .
 ( cell line: LNCaP cells, None) , ( protein: AR, None) , ( protein: PSA, 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: LNCaP cells, None) , ( protein: AR, None) , ( protein: PSA, None) 