ALB and infection: Figure 2A shows the results of single and double infection with the Alb ts6, Alb ts16, Alb ts22, and LA ts6 mutants. The data show that at 40 °C, the mutants Alb ts6, Alb ts16, and LA ts6 were not able to rescue the RNA-negative phenotype of each other and thus, the three mutants were in the same complementation group. In contrast, Alb ts22 was able to rescue the RNA-negative phenotype of Alb ts6, Alb ts16, and LA ts6 and thus, was the sole member of a separate complementation group.