CD8A and infection: Strikingly, whereas T-cell apoptosis ratios increased after infection in WT and Axl−/− mice (Fig. 6c), the percentages of late (7-AAD+AnV+ cells), but not early (7-AADnegAnV+ cells), apoptotic cells increased only in CD4 and CD8 T cells from infected Axl−/− mice (Fig. 6c, d).