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Images of SA‐β‐gal staining detected in passage 4 mesenchymal stem cells ( MSC s). (a) SA‐β‐ga+ of the two groups. Data were not statistically significant; cells were counted from three different fields to compose the average. (b) Control group was cultured in basic medium, (c) Dkk1 group (50 ng/ml), 200× scale bar = 150 μm.
