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(a–c) Confocal micrographs showing the distribution of NaYF4:Yb3+/Er3+@NaYF4:Nd3+-PEG5,475-Alk nanoparticles in Hep-G2 cells at 980 nm excitation with a laser power of 30–50 mW. (a) CellMask™ deep red cell-stained cell membrane, (b) nanoparticles, and (c) overlay of (a,b).
