Flow cytometry analysis of bEnd.3 cells.

<p>Cells incubated with free FITC and QDs (1), MPLs (2), and TAT-MPLs (3) for 0.5 h, 3 h and 12 h at a NP concentration of 20 µg/mL. The NPs were labeled with FITC. The FITC (A and B) and QD fluorescence intensity (C and D) are shown.