Interleukin-6 is produced by epidermal cells and plays an important role in the activation of human T-lymphocytes and natural killer cells. - Luger,T.A.; Schwarz,T.; Krutmann,J.; Kirnbauer,R.; Neuner,P.; Kock,A.; Urbanski,A.; Borth,W.; Schauer,E. (Ann NY Acad Sci, 2008)