Fig. 2From: The fate of systemically administrated allogeneic mesenchymal stem cells in mouse femoral fracture healing In vivo tracking Luc-MSCs in the systemic injection group. a–d The intensity of the signal at the lung site decreased gradually with time, and the signal lasted about 8–9 days following the systemic injection. e Quantitative analysis of the photons at the lung site also confirmed the above-mentioned phenomena. f At day 5–8 following the injection, very weak signals were observed at the fracture site and lasted 1–3 days. Luc-MSC Luciferase labeled mesenchymal stem cellBack to article page