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(a) Schematic illustration of folic acid-QDs and peptide-QDs prepared in one-step synthesis. (b) Bright field and fluorescence images of cells incubated with ZnxHg1-xSe QDs. From left to right: live HeLa cells with folic acid-QDs; live MDA-MB-435S cells with MPA-QDs; live MDA-MB-435S cells with peptide-QDs. The peptide sequence is HHHHHHCGKRK. The images were acquired with a 10× objective.
