IL17F and psoriasis vulgaris: Additionally, disease duration was significantly correlated with CA-induced CLA+ T cell dependent IL-17F and IL-17A, and CLA− T cell dependent IL-17F production in plaque psoriasis (CLA+ T-IL-17F: r = 0.5569, p = 0.0047; CLA− T-IL-17F: r = 0.4112, p = 0.0459 and CLA+ T-IL-17A: r = 0.5873, p = 0.0026).