312-nanometer ultraviolet B light (narrow-band UVB) induces apoptosis of T cells within psoriatic lesions. - Ozawa,M.; Ferenczi,K.; Kikuchi,T.; Cardinale,I.; Austin,L.M.; Coven,T.R.; Burack,L.H.; Krueger,J.G. (J Exp Med, 1999)