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Calcium deposition per scaffold on day 1, 7, 14, and 21. The amount of calcium is expressed as mean±SD (n=4). *Significant difference between the marked group and the two other groups at the same time point (p<0.05). †Significant higher calcium deposition than the PCL scaffold group at the same time point (p<0.05). Detection values from negative empty scaffold controls (n=2) are superimposed on the graph and labeled xempty.
