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MSTC-conditioned media induced endothelial tube formation by HUVECs, but control media did not (A, each image width corresponds to 1.2 mm). Number of junctions (B), total tube length (C), and average tube length (D) were all significantly increased in response to the MSTC-conditioned media. Mean ± 95% CI. *p < 0.05, **p < 0.005, n = 4. HUVEC, human umbilical vein endothelial cell. Color images are available online.
