... The University of Sydney, Westmead, New South Wales, Australia and 4Department of Medicine, University of Calgary, N.W. Calgary, Alberta, CanadaEmail: Haran Sivakumaran - haran.sivakumaran@qimr.edu.au; ... transactivation (the SF2 clone of one-exon tat). The values at the bases of the columns indicate the number of times that particular Tat amino acid sequence was scored in the entire sample set. An asterisk ... The core domainmutation has been reported to suppress but not eliminatetransactivation ability [15-17], and R52 participates in the binding of Tat to TAR and is involved in the nuclear local-isation...