Fig. 2.

Classical NK cell cytolytic markers are enhanced in mice exposed to supplemental oxygen at birth. A: percentage of IFN-γ⁺ NK cells directly ex vivo at day 7 postinfection with influenza A virus infection, as measured by flow cytometry. B: number of IFN-γ⁺ NK cells at days 5 and 7 of influenza A virus infection. C: number of granzyme B⁺ NK cells ex vivo at day 7 postinfection. Data are shown as means ± SE with 8 mice per group from 1 experiment that is representative of 2 independently performed experiments. *P ≤ 0.05, two-tailed Student's t-test.