miR-155-overexpressing T-bet+/‒ OT-I CD8+ T cells (T-bet+/‒ miR-155-OE OT-I) were incapable of expanding to the same capacity as miR-155-OE OT-I at day 10 post-infection in the lungs of influenza virus-infected animals (p = 0.012) (Figures 4A,B). The gene discussed is CD8A; the disease is infection.