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 .
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 .
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