Dyring et al. investigated the impact of the vitamin D analogue—calcipotriol on the incidence of CD4+ and CD8+ T cells and innate lymphoid cells (ILC) and their production of IL-17A, IFN-γ and IL-22 in psoriatic plaques in patients suffering from psoriasis vulgaris. The gene discussed is IL22; the disease is psoriasis vulgaris.