IL17A and chronic obstructive pulmonary disease: The top 15 pathways enriched for 50 DEGs included Airway Inflammation in Asthma, Differential Regulation of Cytokine Production in Macrophages and T helper Cells by IL-17A and IL-17F, and Role of IL-17A in Psoriasis, and Airway Pathology in Chronic Obstructive Pulmonary Disease, as shown in Fig. 3A.