Lastly, we sorted myeloid cells from the livers of infected IL-4Rαflox/ΔLysMCre mice and IL-4Rαflox/Δ littermate controls to confirm that there are macrophages resistant to Il4rα excision during active infection in the liver and to discern whether Lyz2 expression was responsible for this. This evidence concerns the gene IL4R and infection.