Fig. 4

HUMSC-Exos improved histochemical and biomechanical performance in vivo. A–D Representative immunohistochemical staining and quantification of COL1A1, TNMD, and SCXA (n = 6 per group). Scale bar: 100 μm. Red arrow: tendon marker (COL1A1, TNMD, and SCXA) positive areas. ***P < 0.001. E–G Biomechanical analysis of ultimate tensile strength (N), stiffness (N/mm), and Young’s modulus (MPa) (n = 6 per group). *P < 0.05, **P < 0.01, ***P < 0.001