1. Friedmann, T., and Roblin, R. (1972) Science, 175, 949–955.
2. Peng, Z., Yu, Q., and Bao, L. (2008) IDrugs, 11, 346–350.
3. Guan, Y. S., Liu, Y., Zhou, X. P., Li, X., He, Q., and Sun, L. (2006) Gut, 55, 1684.
4. Peng, Z. (2005) Hum. Gene Ther., 16, 1016–1027.
5. Wilson, J. M. (2005) Hum. Gene Ther., 16, 1014–1015.