The fraction and number of LCMV-specific T cells of WT and ERKSEM mice were largely similar at Days 7 and 10 post infection, although slight increases were seen in the absolute number of LCMV-specific CD8+ T cells at Day 7 and the fraction of GP33-specific CD8+ T cells at Day 10 post infection in ERKSEM mice (Figure 3B). This evidence concerns the gene CD8A and infection.