CD8A and infection: We found that IL-7Rα449F mice have reduced proportions of NP366–374 and PA224–233-specific cells within CD8 T cells in the lungs 7 days post-infection (dpi) (Fig. 1a), which phenocopies past observation of this defect at 9 dpi in a new, embryo re-derivation based, specific pathogen free facility17.