Th9 cells orchestrate allergic lung inflammation by promoting recruitment and activation of eosinophils and mast cells. and by stimulating epithelial mucus production. which is known to be mainly dependent on IL-9. These cells share developmental pathways with induced regulatory T cells that may determine the generation of one over the other subset. https://www.roneverhart.com/Doorking-1835-080-Telephone-Entry-System/