3684
To examine the molecular basis of constitutive NF-kappaB DNA-binding activity in HIV1 -infected cells , we analyzed the phosphorylation and turnover of IkappaBalpha protein, the activity of the double-stranded RNA-dependent protein kinase ( PKR ) and the intracellular levels of NF-kappaB subunits in the PLB-985 and U937 myeloid cell models .
 ( cell type: HIV1 -infected cells, None) , ( cell line: U937 myeloid cell models, None) , ( protein: IkappaBalpha, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB subunits, None) , ( protein: double-stranded RNA-dependent protein kinase, None) , ( protein: NF-kappaB, None) , ( cell line: PLB-985, None) , ( protein: PKR, 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 type: HIV1 -infected cells, None) , ( cell line: U937 myeloid cell models, None) , ( protein: IkappaBalpha, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB subunits, None) , ( protein: double-stranded RNA-dependent protein kinase, None) , ( protein: NF-kappaB, None) , ( cell line: PLB-985, None) , ( protein: PKR, None) 