By day 12, F5/LΔP T cells had fallen in number and were not significantly different from F5/B6 cells (Figure 2D), suggesting that expression of L-selectin, which is maintained on all activated F5/LΔP cells (Figure 2C) (Richards et al., 2008), does not improve survival or increase retention of virus-specific CD8+ T cells at the site of infection. The gene discussed is CD8A; the disease is infection.