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RJ and pRJ on the calcium contents in the femoral-diaphyseal and femoral-metaphyseal tissues obtained from normal rats in vitro. Bone tissues were cultured for 48 h in a medium containing vehicle, RJ or pRJ. Each value is the mean ± SE for six rats. RJ, royal jelly; pRJ, protease-treated royal jelly. *Significant difference (P < 0.05) when compared with the control.
