Analysis of IFN-γ-YFP mice revealed diverse immune cell types (identified through gating strategy in Appendix Fig. S9) expressing IFN-γ as early as 24 h post-infection, including NK1.1+ group 1 innate lymphoid cells (ILCs) (comprising both NK cells and ILC1s), T lymphocytes, monocytes, and DCs (Fig. 6A, left panel). Here, IFNG is linked to infection.