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Confocal images of Panc 1 cells treated with up-conversion NPs (A,B) and down-conversion NPs (C, D). (A) and (C) show non-bioconjugated nanophosphors, (B) and (D) show cells targeted with nanophosphors conjugated with anti-claudin 4 and anti-mesothelin, respectively ([124], reproduced by permission of Wiley).
