Fig. 3.

Co-culture of UMSC reveals transfer of material to deficient cells. Lysosomes (red) originating from Hoechst labeled UMSC feeder cells (green) were fluorescently labeled with Lysotracker Red prior to co-culture with Hoechst labeled fibroblasts (blue). This signal gradually increases within the fibroblasts during co-culture with the stained feeder cells, reaching a maximum at 15 min, before gradually declining at 20 min