3Gordon JW. Genetic transferation of mouse embryos by microinjection of puried DNA[J]. USA: Proceedings of the Nation- al Academy of Sciences, 1980, 77: 7380-7384.
4Palmiter RD. Dramatic growth of mice that develop from eggs microinjected with metallothionein-growth hormone fusion genes[J]. Nature, 1982, 300:611-615.
6Lavitrano M, Camaioni A, Fazio VM, et at.. Sperm cells as vectors for introducing foreign DNA into eggs: genetic transfor- mation of mice[J]. Cell, 1989, 57: 717-723.
7Polejaeva IA, Chen SH, Vaught TD, et al. Cloned pigs produced by nuclear transfer adult somatic cells[J]. Nature, 2000, 407: 86-90.