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Fluorescent light intensity of calcium in the cytoplasm of the osteoarthritis (OA) chondrocytes. The calcium in the cytoplasm of the OA-derived chondrocytes under mechanical stretch was increased in a time-dependent manner. Results represent mean ± SD. NS, not significant at P>0.05, the mechanical stretch group vs. the blank group; *P<0.05 and **P<0.01, the mechanical stretch group vs. the blank group.
