(A) Experimental schematic showing the sequential injury approach where mice that had undergone tamoxifen-induced recombination were subjected to two rounds of CTX treatment at 28-day intervals.
(B) Hematoxylin and eosin stain of the regenerated TA muscle after the repeat injury (±SE, p-value< 0.001, n = 3) was used to visualize regeneration and the weight of the regenerated muscle was determined relative to the uninjured contralateral TA muscle (±SE, n = 3), scale bar = 1 mm.
(C) Magnification of the hematoxylin and eosin staining for the repeat-injured TA from (B) showing fibrosis and interstitial cells, scale bar = 50 μm.
(D) Immunofluorescence characterization of MuSCs (Pax7+) in the regenerated TA muscle 7 or 28 days after injury (±SE, p-value < 0.001, n = 4), scale bar = 25 μm.