Figure 4From: Optical characterization of colloidal CdSe quantum dots in endothelial progenitor cellsFluorescence spectra of QDs inside and outside cells. Ten fluorescence spectra for each QD cluster were obtained using ten microscopy excitation powers (lowest = 10% and highest = 100%). Excitation wavelength is 458 nm. (a) QD cluster 1 inside cell, (b) QD cluster 2 inside cell, see Fig. 2; (c) QD cluster 3 outside cells; (d) QD cluster 4 outside cells.Back to article page