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(A–F) Confocal images of MCF7 cells treated with doxorubicin (DOX)-folic acid (FA)-polyethylene glycol (PEG) single-walled carbon nanotubes (SWCNTs) at different incubation time intervals. (A–C) Bright-field images of MCF7 cells; (D–F) fluorescence images of MCF7 cells treated with DOX-FA-PEG-SWCNTs for 1, 3, and 5 hours.
