Table 1.

Developmental efficiencies of rat ESCs at different passages for tetraploid complementation

Background	Rat ESC lines	Sex	Passage	No. injected	No. recipient	No. development in vivo (%)
						Full-term	Live adult
DA	Outgrowth	Male/female	—	72	5	4F/3M (9.7)	1F/2M (4.2)
	DAESC-4	Male	P2	44	1	1 (2.3)	1 (2.3)
			P3	75	3	4 (5.3)	1 (1.3)
			P4	152	5	2 (1.3)	1 (0.7)
			P6	47	1	0	0
			P7	37	1	1 (2.7)	0
			P10	121	3	0	0
			P13	40	1	0	0
			P17	40	1	0	0
	DAESC-5	Male	P3	110	4	3 (2.7)	1 (0.9)
			P4	58	2	0	0
			P6	120	5	3 (2.5)	1 (0.8)
			P7	40	1	0	0
			P11	65	2	0	0
			P15	105	4	0	0
			P20	85	2	0	0
	DAESC-6	Male	P4	130	4	4 (3.1)	1 (0.8)
			P11–P13	231	4	0	0
	DAESC-7	Female	P2	45	2	0	0
			P3	62	4	0	0
			P10	123	6	0	0
	DAESC-8	Female	P10–P12	87	5	0	0
BN × SD	Outgrowth	Male/female	—	30	1	1F/2M (10.0)	2M (6.7)
	BSESC-2	Male	P1	105	3	1 (0.9)	0
			P2	109	3	0	0
			P3	103	3	1 (1.0)	0
			P5	92	2	0	0
			P6–P10	379	12	0	0
	BSESC-3	Female	P2–P12	292	14	0	0

BN × SD, Brown Norway strain mated with Sprague–Dawley strain; DA, Dark Agouti strain; F, female; M, male.