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Effects of dispersed ZnO particles or dissolved ZnCl2 on the expression levels of membrane type receptors. Expression levels of (A) VEGFR2 and (B) CXCR4 mRNA in ECFCs exposed to 25 μg/ml of dispersed ZnO particles and the corresponding concentration of dissolved ZnCl2 for (a) 1 h, (b) 3 h, or (c) 6 h. Data are mean ± SD of three or four replicates. *p < 0.05 vs. control (0 μg/ml).
