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CSD induced the up-regulation of OPN expression in the condylar cartilage of rat TMJs. A. DAB staining of OPN in rat temporomandibular joint at the different groups. (bar = 10 μm, n = 10). B. The changes of OPN expression in the TMJ at different time of the CON group and the CSD group. (n = 10). *P<0.05 vs the control group, **P<0.01 vs the control group.
