Table 1. Percentages (%) of mouse embryos developing into different pre-implantation stages after microinjection of LIF-siRNA or scrambled-siRNA at the two-pronuclear stage.

	Untreated (n = 51)	Solution (n = 30)	scramble (n = 87)		LIF-siRNA (n = 24)
Two-cell	90.2	93.3		93.1	91.7
Four-cell	85.7	86.7		92.0	75.0
Morula	83.4	83.3		89.7	58.3a
Blastocyst	83.4	80.0		86.2	41.7a

^aP<0.05 compared with the untreated group.