1842
J delta K cells were isolated as a chronically infected survivor cell line , following infection of Jurkat CD4+ T cells with dl-NF , a mutated strain of human immunodeficiency virus type 1 ( HIV-1 ) containing a deletion of the long terminal repeat ( LTR ) NF-kappa B sites.
 ( protein: NF-kappa B, None) , ( cell line: chronically infected survivor cell line, None) , ( DNA: long terminal repeat, None) , ( cell line: J delta K cells, None) , ( DNA: LTR, None) , ( cell line: Jurkat CD4+ 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: NF-kappa B, None) , ( cell line: chronically infected survivor cell line, None) , ( DNA: long terminal repeat, None) , ( cell line: J delta K cells, None) , ( DNA: LTR, None) , ( cell line: Jurkat CD4+ T cells, None) 