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Exclusion of QDs from labeled cells. (A) Supernatants from cultured ESCs and MEFs at 24 hours post QD-labeling were concentrated and observed under fluorescent microscope. Red dots represent QDs. Bars: 10 μm. (B) MEFs were labeled with the supernatants collected from QD-labeled ESCs or MEFs in culture at 24 and 48 hours post labeling. Representative histograms of QD fluorescence in re-labeled MEFs right after labeling are shown.
