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(A) Hela cell uptake of Dox (5 µM), (FK)2-Dox (5 µM of Dox) and FKK-Dox (5 µM of Dox) analyzed by fluorescence microscopy. The images were acquired with live cells. The cells were incubated with different Dox species for 6 h, after that, the medium was removed and replaced with fresh medium. The emission of Dox was designated with yellow color. (B–D) The fluorescent intensity alongside the white dashed lines in Figure 4A.
