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The release of QDs from MSCs. (a) QD loss in complete medium (FBS +) and serum-free medium (FBS −) after primary QD labelling (0 h) and 24 and 48 h after labelling. The statistical significance is shown in comparison to 0 h. (b) Secondary QD labelling of MSCs by supernatants from primarily labelled MSCs. (c) The comparison of Ki67 expression in complete and serum-free medium after labelling (0 h) and after 24 h and 48 h of cultivation; *p-value < 0.05, ***p-value < 0.001.
