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Human OE-MSCs labeled with DiI (A); and implanted with collagen hydrogel in a rat calvarial defection with critical size defect (7 mm) (B1,B2); Representative optical image of blank scaffold group (C); and covering images of X-ray and fluorescence images reveal a large number of DiI+ OE-MSCs at the calvarial defective region in OE-MSCs group after 72 h (D) (scale bar: 100 μm).
