Table 1.

Number of nonadherent cells recovered following 1 week of coculture of AA4.1⁺ yolk sac stem cells with YS-ECs

Endothelial cell clone used for coculture	No. of nonadherent cells recovered	Increase in cell no.
Control (none)	0	0
C165	<1000	<1×
C166	36,194 ± 5762	36.2×
C167	2359 ± 487	2.3×

AA4.1⁺ yolk sac stem cells (10³ cells) were cocultured with cloned YS-ECs for 7 days. Nonadherent cells were removed from individual cultures and enumerated. The results represent data from three independent experiments ± SD.