These data suggest that differentiated myotubes may secrete growth factors or cytokines such as SDF-1 or TNF-?? that favor mesoangioblast transmigration by either a chemotactic effect and/or by modifying the endothelium barrier.Mesoangioblast migration in vivoTo assess the ability of mesoangioblasts to migrate in vivo from the vessel lumen to muscle interstitial tissue (see Fig. 8), we injected 5