1. Susin, S. A. et al.Nature 397, 441–446 (1999).
2. Li, P. et al. Cell 91, 479–489 (1997).
3. Liu, X., Kim, C. N., Yang, J. R. J. & Wang, X. Cell 86, 147–157 (1996).
4. Susin, S. A. et al. J. Exp. Med. 184, 1331–1342 (1996).
5. Enari, M. et al. Nature 391, 43–50 (1998).