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TEM images of LT97 cells; (a) untreated control; (b,c) 123 µmol/L ZnO NP < 50 nm for 24 h; (d) enlarged section of c; (e,f) 123 µmol/L ZnO NP < 100 nm for 24 h; (g) enlarged section from f; (h) 123 µmol/L ZnCl2 for 24 h; red arrows mark possible ZnO NP.
