Figure 4

Colocalization of QDs with lysosomes. MCF-7 cells were treated with QD655-COOH for 12 h then incubated with LysoTracker Yellow for specific staining of lysosomes. Fluorescence from each channel was recorded and merged. The orange color seen in the stained cells resulted from the merging of the red fluorescence from QDs and the yellow color of the LysoTracker dye. The white bars represent 20 μm