6De Felici M,M claren A.In vitro culture of mouse PGCs.Cell.Res.1991,144:417~427.
7Amit M Carpenter MK,Inokuma M S,et al.Clonally derived human embryonic stem cell lines maintain pluripotential and proliferative potential for prolonged periods of culture.Dev Biol,2000,227,271~278.
8王廷华 羊惠君 John W.Mcdonald,干细胞理论与技术,科学出版社,2005,(1),7~8.