14523
The long terminal repeat ( LTR ) of the type 1 human immunodeficiency virus ( HIV-1 ) and the 5' regulatory region of the gene encoding the interleukin 2 receptor alpha subunit ( IL-2R alpha ) share functional kappa B enhancer elements involved in the regulation of these inducible transcription units during T-cell activation .
 ( DNA: 5#$%# regulatory region, None) , ( protein: IL-2R alpha, None) , ( protein: interleukin 2 receptor alpha subunit, None) , ( DNA: long terminal repeat, None) , ( DNA: LTR, None) , ( DNA: kappa B enhancer elements, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: 5#$%# regulatory region, None) , ( protein: IL-2R alpha, None) , ( protein: interleukin 2 receptor alpha subunit, None) , ( DNA: long terminal repeat, None) , ( DNA: LTR, None) , ( DNA: kappa B enhancer elements, None) 