Although classically described the importance of CD4+ and CD8+ T lymphocytes, γδ T lymphocytes and NK cells in the expression of IL-17, studies have shown that eosinophils and neutrophils can produce large amounts of IL-17 in the lung, which is related to inflammation lung disease in allergic models and in infections (2, 31-36). The gene discussed is IL17A; the disease is lung disorder.