1[1]Wilrnut I,Schnieke A E,Mewl1ir l et al.Viable offspring derived from fetal and adult mammalian cells[J].Nature,1997,385:810-813.
2[2]chnieke A E,Kind A J,Ritchie WA,et al.Human factor IX transgenic sheep produced by transfer of nuclei from transfeeted fetal fibroblasts[J].Science,1997,278:2130-2133.
3[3]Polejaeva I A.Cloning pigs:advances and applications[J].Reprod Suppl,2001,58:293-300.
4[4]Tian X C,Kubota C,Yang X.Cloning of aged animals:a medical model for tissue and organ regeneration[J].Trends Cardiovase Med,2001,11:313-317.
5[5]Byrne J A,Gurdon J B.Commentary on human cloning[J].Differentiation,2002,69:154-157.
