Fig. 7.

Fluorescence images of bare CDs and arginine-modified CDs in NIH3T3, HEK293, Hela and MCF-7 cells. The cells are observed under a fluorescence microscope following treated with bare CDs (A) or arginine-modified CDs (B) for 2 h. Scale bar 20 μm (C).The total and separate fluorescence intensities in different cell lines as recorded with a microplate reader. The Data were expressed as + SEM (n = 6). Image adapted from [81].