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At 4 weeks, over 90% of wound area in the control aging tendons stained positive for the senescence marker, β-gal A.-E.; however, less than 30% of wound area in MTR group was positive for β-gal B.-F.. At 8 weeks, senescent marker expressing cells were still found in control aging tendons C.-G., while only a few cells in MTR group were positive for β-gal D.-H.. Red bars: 500 μm; Black bars: 200 μm.
