5232
Analysis of long terminal repeat -driven secreted alkaline phosphatase activity in transient assays showed that, unlike human immunodeficiency virus type 1 , the SIV long terminal repeat possesses an enhancer region just upstream of the NF-kappaB element which maintains significant levels of basal transcription in the absence of NF-kappaB and Sp1 sites .
 ( DNA: enhancer region, None) , ( DNA: NF-kappaB element, None) , ( DNA: SIV long terminal repeat, None) , ( DNA: long terminal repeat, None) , ( protein: alkaline phosphatase, None) , ( protein: NF-kappaB, 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: enhancer region, None) , ( DNA: NF-kappaB element, None) , ( DNA: SIV long terminal repeat, None) , ( DNA: long terminal repeat, None) , ( protein: alkaline phosphatase, None) , ( protein: NF-kappaB, None) 