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dECM@exo can maintain the mechanical properties of the intervertebral disc. Scale bar = 2 cm. A Image of the construction of a disc degeneration model. B Calculation method of the disc height index. C X-ray images of the intervertebral disc at 0, 4, 8, and 16 weeks. D DHI differences among the control, degeneration, DECM and dECM@exo groups at each time period. Data are presented as the mean ± SD (n = 3). *P < 0.05
