IL17A and dermatitis: In a separate study, induction of skin inflammation by applying Imiquimod topically to the epidermis promoted the preferential expansion of Vγ4+ IL-17 producing cells, but did not specifically stimulate expansion of the dermal Vγ6+ cells, although some proliferation of Vγ6+ cells was evident by Ki-67 staining and they showed some increase in production IL-17A, though to a lesser than Vγ4+ cells [44].