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Structure-efficacy relationship of sphere (sZnO), ellipsoid (eZnO), short rod (srZnO), long rod (lrZnO), cubic (cZnO), urchin-like (uZnO), and platelet-like ZnO (pZnO) toward cytotoxicity. (A) PANC-1 cell viability after treated with ZnO of different structures at particle concentrations ranging from 1 to 50 μg/mL for 24 h. (B) The corresponding IC50 values of ZnO of different structures from (A).
