Eight days post-infection, short-lived terminal effector (TE) P14 T cells (CD45.1+ CD8+ Klrg1+ CD127−) and memory precursor (MP) P14 T cells (CD45.1+ CD8+ Klrg1− CD127+) were isolated from spleens by FACS (Fig. 1a, Supplementary Fig. 1). This evidence concerns the gene IL7R and infection.