... contains an enhancersequence. Virology 1991, 182:130-134.22. Tajima S, Takahashi M, Takeshima SN, Konnai S, Yin SA, Watarai S,Tanaka Y, Onuma M, Okada K, Aida Y: A mutant form of the taxprotein ... Tana , Watarai S, Aida Y, Tajima S, Kakidani H, Onuma M, Kodama H:Growth inhibition of cancer cells by co-transfection of diph-theria toxin A- chain gene plasmid with bovine leukemiavirus-tax ... BLVLTR transactivation [34]. Tax transcriptional activityrequires an amino-terminal zinc finger and an internalleucine-rich activation domain [9]. Phosphorylation-defi-cient Tax mutants have been...