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Cells viability normalized on the control vs concentration (logarithmic) of CuNPs at (a) 4 h and (b) 24 h. Lines and colors refer to different surface ligands on NPs (8-mercaptooctanoic acid (MOA), 12-mercaptododecanoic acid (MDA), and 16-mercaptohexa-decanoic acid (MHA)). Reprinted with permission from ref (103). Copyright 2009 Royal Society of Chemistry.
