IFN-γ from the Vγ1 cells increased at 4 weeks post-infection, and then decreased at 6 weeks post-infection (F(2, 12) = 44.56, P < 0.0001) (Fig. 2d), as did IFN-γ from the Vγ2 cells (F(2, 12) = 23.84, P < 0.0001) (Fig. 2l). This evidence concerns the gene IFNG and infection.