They assessed IL-10 production using the tiger IL-10 GFP-reporter mouse model (where the 3′UTR of IL-10 remains unaltered) and found that GFP staining was selectively increased in NK cells from the spleen, liver, and blood of Lm-infected mice at 72 h post-infection, whereas the IL-10 GFP-reporter expression was not observed at 24 h post-infection. The gene discussed is IL10; the disease is infection.