ΔN-β-catenin renders nonpermissive cells permissive for Tcf virus replication. (A and C) Western blots done at 24 h postinfection for NS1 and ΔN-β-catenin in cells infected with phH1, vMM66, and vMM74. (B and D) Burst assays measuring virus production at 48 h postinfection with phH1, vMM66, and vMM74, expressed as the ratio of virus production in the presence and absence of ΔN-β-catenin. (A and B) ΔN-β-catenin expression was induced in cMM1 cells by tetracycline removal. (C and D) 293T and cR2 cells (293T derivatives expressing ΔN-β-catenin).