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In vivo tracking of engrafted mesenchymal stem cells (MSCs) at 24 and 48 h. Representative images of kidney (Kid.), spleen (Spl.) and thymus (Thy.) sections from diabetic rats injected with 5×106 of CM-DiI labeled MSCs at 24 and 48 h after cell infusion. MSCs labeled with CM-DiI showed red fluorescence (arrow), and nuclei were stained by DAPI with blue fluorescence. Magnification, ×400.
