Table 1.

In vitro development of rhesus monkey embryo after injection of lentiviral vector

	Development stage (%)
Group	Embryos used/monkeys*	One-cell stage	Two-cell stage	Eight-cell stage	16-Cell stage	Morula	Blastocyst
Four to eight cells	12/3	12	10 (83.3)	8 (66.7)	6 (50.0)	6 (50.0)	6 (50.0)
One or two cells	19/3	19	17 (89.5)	16 (84.2)	14 (73.7)	11 (57.9)	10 (52.6)
Control	15/3	15	13 (86.7)	10(66.7)	10 (66.7)	9 (60.0)	9 (60.0)

*The one-cell–stage embryos from three monkeys were collected and pooled. They were randomly assigned to each of three groups: one- or two-cell stage with lentiviral infection, four- to eight-cell stage with lentiviral infection, or one- or two-cell stage control group (noninjected IVF embryos). There were no significant differences in developmental rates in either experimental group or in the control group (P > 0.05).