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Cytotoxicity assay of the MSCs cocultured with (a) 0.1% Triton-X (negative control), complete culture medium containing; (b) no supplement (control); (c) 1000 μg/mL blank PLGANPs (PLGANPs); (d) 1000 μg/mL TGF-β3-loaded PLGANPs (TGF-β3-PLGANPs); and (e) 10 ng/mL TGF-β3 (TGF-β3) in the medium (magnification: 100x, scale = 200 μm). Data were expressed as means ± SD (n = 3).
