CD8A and influenza: Thus, cell‐extrinsic factors shared by naturally aged and LmnaDhe mice selectively restrict expansion of influenza NP366–374‐specific CD8+ T cells promoting skewed immune dominance with aging that favors expansion of PA224–233 to NP366–374 influenza‐specific CD8+ T cells (Po et al., 2002; Yager et al., 2008; Jiang et al., 2009).