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K562 cells treated with 10 mM of gold nanoparticles (AuNPs) with their surface modified by polyethylene glycol (PEG-AuNPs) for 24 h. Fluorescence could be detected with emission wavelengths from 500–700 nm by (a) fluorescence microscopy: bright field images (left), fluorescent images (middle), and merged bright field and fluorescent images (right). Original magnification is 1,000x for all panels and (b) flow cytometry analysis.
