9640
PDBu -treated HL-60 cells remained viable for 7 days and thereafter began to die via apoptosis , with a concomitant down-regulation of Bcl-xL .
 ( cell line: HL-60 cells, None) , ( cell line: PDBu -treated HL-60 cells, None) , ( protein: Bcl-xL, 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: HL-60 cells, None) , ( cell line: PDBu -treated HL-60 cells, None) , ( protein: Bcl-xL, None) 