CD8A and infection: To investigate whether the impaired proliferation of GFI1ΔCD8 CD8+ T cells observed following primary infection also impacted CD8+ T cell recall responses, we isolated WT and GFI1ΔCD8 CD8+ TM cells from LCMVc13-infected mice at day 5 after infection and co-transferred them to a secondary host followed by heterologous infection with LCMVArm or MCMV-ie2-gp33 (Extended Data Fig. 9d).