Figure 1 5-Ethynyl-2-deoxyuridine (EdU) labeling of UC-MSCs in vitro and tracking EdU-labeled human umbilical cord-derived mesenchymal stem cells (UC-MSCs) in vivo. UC-MSCs labeled by EdU and stained with Apollo 567 (A, red fluorescence) and Hoechst 33342 (B, blue fluorescence). EdU-labeled UC-MSCs stained with Apollo 567 in harvested rat bladders (E, red fluorescence), Hoechst 33342 (F, blue fluorescence). The boxed areas in the ×40 magnified images in (C) and (G) were amplified ×200 in the corresponding (D) and (H), respectively. White arrows point to nuclei that are presented in the graphs.