2212
To investigate the effects of human immunodeficiency virus type 1 ( HIV-1 ) Tat on interleukin-2 ( IL-2 ) expression , we used IL-2 promoter -chloramphenicol acetyltransferase constructs and IL-2 -secreting Jurkat T cells as a model system.
 ( protein: IL-2, None) , ( protein: IL-2, None) , ( protein: human immunodeficiency virus type 1 ( HIV-1 ) Tat, None) , ( cell line: IL-2 -secreting Jurkat T cells, None) , ( DNA: IL-2 promoter, None) , ( protein: IL-2, None) , ( protein: interleukin-2, None) , ( protein: -chloramphenicol acetyltransferase, None) , ( DNA: IL-2 promoter -chloramphenicol acetyltransferase constructs, None) , ( cell line: Jurkat T cells, 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: IL-2, None) , ( protein: IL-2, None) , ( protein: human immunodeficiency virus type 1 ( HIV-1 ) Tat, None) , ( cell line: IL-2 -secreting Jurkat T cells, None) , ( DNA: IL-2 promoter, None) , ( protein: IL-2, None) , ( protein: interleukin-2, None) , ( protein: -chloramphenicol acetyltransferase, None) , ( DNA: IL-2 promoter -chloramphenicol acetyltransferase constructs, None) , ( cell line: Jurkat T cells, None) 