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(A) Confocal microscopy images of HT-29 cells after incubation with FITC-labeled TD for 4 h (green FITC represented the location of TD); (B) confocal microscopy images of intracellular uptake of DOX by HT-29 cells after incubation with listed treatments for 2 h; (C) flow cytometry histograms of intracellular DOX uptake after incubation with listed treatments for 1 h.
Abbreviations: DOX, doxorubicin; TD, tetrahedron; FITC, fluorescein isothiocyanate; F, folic acid; S, SL2B.
