Table 1.

Morphology of Microvessels in Spheroids

Morphology	Group 1	Group 2	Group 3
Dispersed	88 ± 13%	23 ± 4%	8 ± 3%
Clumped	13 ± 13%	38 ± 2%	34 ± 13%
Clustered	0 ± 0%	39 ± 6%	59 ± 16%

Values after a ± indicate standard error of the mean. Spheroids Table 1 were categorized by morphology into four groups—“dispersed,” “clumped,” “clustered,” and “lumen thick wall.” Values in the table indicate the average percentage of spheroids in a group with the indicated morphology.