6902
Intriguingly, surface expression of LT-alpha1beta2 is up-regulated on a T cell line acutely infected with HIV-1 , suggesting a positive feedback loop between HIV-1 infection , LT-alpha1beta2 expression , and HIV-1 replication .
 ( protein: LT-alpha1beta2, None) , ( cell line: T cell line, None) , ( protein: LT-alpha1beta2, 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: LT-alpha1beta2, None) , ( cell line: T cell line, None) , ( protein: LT-alpha1beta2, None) 