1122
OBJECTIVES: To analyze the effect of retinoic acids ( RA ) on HIV-1 expression and correlate this effect with expression levels of RA receptors ( RARs ) in T-lymphoid and monocytoid cell lines .
 ( protein: RA receptors, None) , ( protein: RARs, 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:
 ( protein: RA receptors, None) , ( protein: RARs, None) 