Fig. 4.
Phase-contrast (left panel) and corresponding epi-fluorescence (right panel) microscopy images: (a) MDA-MB-231 cells incubated with MMCNPs for 3 hours, showing significant Qdot fluorescence; (b) MDA-MB-231 cells incubated with MMCNPs for 24 hours, again showing significant Qdot fluorescence that is similar to the 3 hour incubation experiment; (c) control experiment performed with MDA-MB-231 cells to which no MMCNP were added; (d) control experiment performed with mouse thymus stromal epithelial cells, TE-71 incubated with MMCNPs for 24 hours.