13114
Its 50% effective and cytotoxic concentrations were 0.016 and 2.2 microg/ml in PMA -stimulated U1 cells , respectively.
 ( cell line: PMA -stimulated U1 cells, 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: PMA -stimulated U1 cells, None) 