Cells from aging tendon without Met treatment show few NS positive cells (A, B), or CD73 positive cells (J, K), but the number of NS positively stained cells (C-H, I) increases in a Met concentration-dependent manner. However, the number of CD73 positively stained cells has no significant difference between 500 and 1000 μg/ml Met concentrations (N-Q, R). Semi-quantification confirms the results (I, R). White bars: 100 μm; Yellow bars: 20 μm, *p < 0.01 (treatment groups compared to without Met).