Vogt, L. et al., 2006, J Clin Invest.116: 2817-2826. Helmy, K. et al., 2006, Cell. 124:915-927. Wiesmann, C. et al., 2006, Nature. 444:217-220. Zang,X. et al., 2006, J Clin Invest. 116: 2590-2593. Katschke, KJ. et al., 2007, J. Exp. Med. 204:1319-1325. He,JQ. et al., 2008, Mol Immunol. 45: 4041-4047.