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Mean phosphate concentration per group as measured in the cell culture medium, normed for 10,000 cells. The error bars show the error of mean. Significances are indicated by stars: bold stars indicate a significance compared to the negative control CTRL, stars in italics indicate a significance compare to the osteogenic control OM. * = significance p ≤ 0.05, *** = significance p ≤ 0.001.
