<p>ECFCs expanded on fibronectin or collagen showed a similar ability to form capillary-like structures in vitro. Independently from the substrate used for cell culture, ECFCs cultured in Matrigel gave rise within 12 hours of incubation to vascular structures. Representative phase-contrast photographs showing that the capillary-like structures formed by ECFCs cultured on fibronectin and collagen were similar. Photographs were obtained using an Olympus inverted microscope IX51, x4 magnification.</p
