IL2RA polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’IL17A polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’IL12B polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’IL23R polymorphism mutation variant mutation OR variant OR polymorphism “ Alopecia Areata’’. The gene discussed is IL2RA; the disease is alopecia areata.