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Confocal images of CL4 QDs (A) or PEG QDs (B) without peptide. (A) CL4-coated QDs showed intracellular delivery to neuronal cell bodies in the CA3 cell layer of a hippocampal slice culture after 24 h application. (B) PEG coated QDs were not delivered intracellularly and remained on the periphery of cell bodies in the CA3 cell layer after 24 h. QD is red, Nissl is green, DAPI is blue. Scale bars are 20 μm.
