At 60 d.p.i. of CX3CR1+/GFP reporter mice, the majority of CD8+ T cells in the blood and spleen, which were specific for OVA (after AdOVA or L.m.-OVA infection) or LCMV-gp33, showed GFP (CX3CR1) expression (Fig. 1g and Supplementary Fig. 1G). Here, CD8A is linked to infection.