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Receptor activator of nuclear factor-κB ligand (RANKL)/osteoprotegerin (OPG) ratio of bone mesenchymal stem cells affected by intermittent traction stretch. The values are the mean ± standard deviation (*P<0.05, **P<0.01 as measured using an unpaired Student’s t-test; n=3). CON, non-loading group; STR, stretching group.
