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Ultrastructure observations of the repaired tendons at 8 weeks after surgery. Histogram and distribution of collagen fibril diameters in the control (a, d), GelMA (b, e), and TSC-Exos groups (c, f). g Quantitative analysis of collagen fiber diameter in each group (1000 fibers). Data are represented as mean ± SD. *, vs control; #, vs GelMA group. (n = 6). ***P < 0.0001, ###P < 0.0001
