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RJ and pRJ on the PTH-induced osteoclast-like cell formation in mouse marrow cultures in vitro. Mouse marrow cells were cultured for 7 days in a medium containing vehicle, RJ or pRJ in the presence or absence of PTH (10−7 M). Each value is the mean ± SE for four wells. PTH, parathyroid hormone; RJ, royal jelly; pRJ, protease-treated royal jelly. *Significant difference (P < 0.01) when compared with the control.
