Table 1. In vitro development of the chimeric embryos produced by injection or aggregation method.

Donor cells	Method	Stage of host embryos	No. of embryos cultured	Blastocysts (%)	Chimeric blastocysts (%)
ICM	Injection	Mourla	29	27 (93.1)	24 (82.8)
ICM	Aggregation	Morula**	24	23 (95.8)	20 (83.3)
ICM		4–8 cell**	26	23 (88.5)	17 (65.4)
Morula*		Morula*	34	31 (91.2)	24 (70.6)
Morula*		4–8 cell*	26	23 (88.5)	17 (65.4)
4–8 cell*		4–8 cell*	46	37 (80.4)	27 (58.7)

^*Blastomeres isolated from single embryos.

^**Blastomeres isolated from two embryos.