FIG. 5.

Analysis of the ability of the mutant viruses to use different Tva receptors. Cell lines expressing the chicken Tva receptor, chicken DF-1 cells (DF-1) and line 0 chicken embryo fibroblasts (CEF), or the quail Tva receptor, quail QT6 cells (QT6) and NIH 3T3 cells expressing the quail pg950 Tva (3T3pg950), were infected with 10-fold serial dilutions of Y142N, E149K, Y142N/E149K, or wild-type RCASBP(A)AP DF-1 virus stocks, and the viral titer was determined by the AP assay. The results shown are an average of three different experiments. Error bars show standard deviations.