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Mineralization of MEPM cells. MEPM cells were cultured with and without 0.5 μM ATRA for up to 28 d. Representative photographs of the alizarin red staining (A) and quantitative analysis of the alizarin red staining (B) on days 7, 14, 21, and 28 are shown. Data of the quantitative analysis are presented as mean ± SD (N = 2)
