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An ELISA of CD31 content of all of the experimental groups cultured without osteogenic supplements at 1, 2, and 3 weeks after the addition of HUVECs/MSCs. ap < 0.05 versus CP21-HUVECs, and *p < CP21+HUVECs:MSCs. (n = 6 samples per group per time point.) Error bars denote standard deviation. Color images available online at www.liebertpub.com/tea
