IL4R (Interleukin 4 Receptor): IL4R is a receptor for the cytokine interleukin 4 (IL4), which plays a key role in the differentiation of naive T cells into Th2 cells. IL4R signaling is essential for promoting B cell proliferation, antibody production, and the regulation of allergic responses, including IgE production. Dysregulation of this pathway has been linked to asthma, atopic dermatitis, and other allergic conditions, making IL4R an important target for therapeutic intervention.