In the case of IL-17A-producing neutrophils, they are increased in the peripheral blood of patients with asthma who are allergic to fungus [22], as well as in the plaques of psoriasis patients [23], and in the joints of patients with ankylosing spondylitis but not in those of patients with osteoarthritis [24]. The gene discussed is IL17A; the disease is ankylosing spondylitis.