CD8A and infection: RNA sequencing (RNA-seq) of GFI1hi and GFI1lo CD8+ T cells isolated from LCMVArm-infected or LCMVc13-infected mice (Extended Data Fig. 2a) showed that GFI1hiCD8+ T cells responding to both infections exhibited a similar transcriptional profile, which was distinct from that of GFI1loCD8+ T cells (Extended Data Fig. 2b).