Fig. 5

The effect of LV-FGF-2⁺-hGMSC-CM on the tube formation of HUVECs in vitro. HUVECs were cultured on the matrigel matrix with or without different CMs added. The tube-like structures were photographed under an inverted microscope at × 40 magnification and the total tube length and the total branching length analyzed by ImageJ software at 4 h (a–c) or 24 h (a, d, and e). ns = no significant difference, *p < 0.05, **p < 0.01