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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Mater Sci Eng C Mater Biol Appl. 2018 Dec 29;97:784–792. doi: 10.1016/j.msec.2018.12.113

FIGURE 3.

FIGURE 3.

Brightfield images of (a) EGFR-negative (H520) cells and (b) EGFR-positive (A549) cells. (c) and (d) show the corresponding NIR darkfield images of cells incubated with UCNPAuNR nanoclusters and then washed off with PBS.