NK cell recruitment is unimpaired in infected LPL−/− mice. (A) Percentages of NK cells found in the lungs of either naive WT (gray circles) and LPL−/− (filled circles) mice or mice 24 h after pneumococcal infection. Each symbol represents data from one mouse, lines represent median values, and data are from at least two independent experiments. (B) Percentages of splenic NK cells positive for IFN-γ following in vitro stimulation with IL-12 and IL-15. Cells were from WT (gray bars) or LPL−/− (filled bars) mice; data shown are means ± standard errors of the means (n = 3 mice in each group). (C) Percentages of lung NK cells positive for IFN-γ 24 h after pneumococcal infection. Each symbol represents data from one animal (open circles, uninfected WT mice; gray circles, infected WT mice; filled circles, infected LPL−/− mice), lines represent median values, and data are from two independent experiments.