IFNL2 and Nasal polyposis: The results showed that IFN-λ2 clearly expresses in glandular epithelial cells and some large cells (most likely mast cells or macrophages) in tonsillar tissue (Figure 3(b)) and in some large cells in lung tissue (Figure 3(d)) and nasal polyps (Figure 3(f)) as compared with the negative control tissues (Figures 3(a), 3(c), and 3(f)).