quantum dot article 22 Quantum Dots 20 controlled study 14 fluorescent dye 12 human 12 priority journal 12 streptavidin 12 Endocytosis 10 Fluorescent Dyes 10 Quantum dots 10 human cell 10 internalization 10 Fluorescence Resonance Energy Transfer 8 Humans 8 Microscopy, Fluorescence 8 chemistry 8 fluorescence microscopy 8 fluorescence resonance energy transfer 8 nanoparticle 8 nonhuman 8 Animals 6 Nanoparticles 6 Semiconductor quantum dots 6 animal cell 6 biotinylation 6 cell membrane 6 confocal microscopy 6 cyan fluorescent protein 6 endocytosis 6