2Morton O, Williams N. First Dolly, now headless tadpoles [J]. Science, 1997 Oct 31, 278 (5339): 798.
3National Research Council. Scientific and Medical Aspects of Human Reproductive Cloning [M]. The National Academies Press, 2002. 153-6.
4Zajtchuk R. New technologies in medicine: biotechnology and nanotechnology [J]. Dis Mon 1999 Nov, 45(11): 449-95.
5Tong WF, Ng YF, Ng SC. Somatic cell nuclear transfer (cloning): implications for the medical practitioner[J]. Singapore Med J 2002 Jul; 43 (7) : 369-76.