PTGDR2 and infection: Intriguingly, a Gpr44−/− hematopoietic system in mice with a WT nonhematopoietic compartment conferred increased susceptibility to infection (Fig. 2 i), despite no significant differences in the accumulation of ILC2s (Fig. S2 a) or eosinophils (Fig. S2 b) in the MLN between any of the groups.