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IL-15 levels were increased in the femoral heads and serum of mice with steroid-induced ONFH. a IL-15 expression in the femoral heads was assayed with quantitative real-time RT-PCR. b IL-15 levels in the serum were detected by ELISA. Sham = operated control group, ON = osteonecrosis group, Il15−/− = osteonecrosis IL-15 deficiency group. The data were expressed as means ± SD (n = 6). **p < 0.01 versus the ON group
