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Effect of gold nanoparticles (AuNPs) with their surface modified by polyethylene glycol (PEG-AuNPs) on mitochondrial transmembrane potential reduction in K562 cells. Bar chart representing the relative level of mitochondrial transmembrane potential between K562 cells treated with PEG-AuNP and control medium for 24–72 h (compared with the control medium: *P < 0.05 and **P < 0.01).
