Scid and wild type BMDMs both induce IL-12 (p40) gene expression upon infection with L. monocytogenes and the addition of exogenous IL-18 rescues IFN-γ production by NK cells co-cultured with L. monocytogenes-infected Scid BMDMs (Figure 7B and Figure 7—figure supplement 1). The gene discussed is IL18; the disease is infection.