1. Das, J. et al. Nature Immunol. 2, 45–50 (2001).
2. Yang, L. et al. J. Exp. Med. 188, 1739–1750 (1998).
3. Hilliard, B. et al. J. Immunol. 163, 2937–2943.
4. Torgerson, T. R. et al. J. Immunol. 161, 6084–6092 (1998).
5. Kolenko, V. et al. J. Immunol. 163, 590–598 (1999).