Figure 1

Cellular uptake of QDs in human mammary non-tumorigenic MCF-10A cells and carcinoma MCF-7 cells. The QD-treated cells were incubated with 0.8 nM QD655 coated with carboxylic acid (COOH) for 12 h at 37°C. Blue color represents DAPI-counterstained nucleus, while red color was fluorescence emitted from QD655. The white bar represents 20 μm.