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Colony forming efficiency of metanephric mesenchymal stem cells (MMSCs). Colonies with the morphology of MMSCs were cultured for 14 days. (A) P4, (B) P10 and (C) P16 (stain, Giemsa; scale bar, 100 µm). (D) Bar chart showing the cloning rates for different passages of MMSCs (**P<0.01).
