Lastly, we examined the model of psoriasis-like skin inflammation induced by topical application of Aldara cream (imiquimod, IMQ) where RORγt+ γδ T cells and ILC3s, but not αβ T cells, are the primary source of pathogenic IL-17A, IL-17F and IL-228, 9, 40. Here, IL17A is linked to psoriasis.