14284
ACH-2 , derived from a human T cell line ( CEM ), is chronically infected with HIV-1 , with low levels of constitutive virus expression .
 ( cell line: CEM, None) , ( cell line: ACH-2, None) , ( cell line: human T cell line, 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: CEM, None) , ( cell line: ACH-2, None) , ( cell line: human T cell line, None) 