(a)
(b)
(c)
Figure 1: The vascular tube formation in huVECs on Matrigel in vitro. ((a) and (b)) huVECs formed longer vascular tubules following culture in term hAEC-conditioned media compared to control media (), and tubule lengths were stable for 40 hours. huVECs cultured in preterm hAEC-conditioned media did not support tubule formation where tubule length was significantly reduced at 20 hours (). (c) Representative pictures of vascular tubules of huVECs following culture in term hAEC-conditioned media and control media ().