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In vitro cytotoxicity of free dopamine and corresponding concentrations of dopamine-loaded NPs, Lf-NPs, and Lf-BNPs on 16HBE (a) and SH-SY5Y cells (b). Cells were exposed to different concentrations of free dopamine, NPs, Lf-NPs, and Lf-BNPs for 24 h and cell viability was measured. Values represent the mean ± SD (n = 3). *p < .05; **p < .01 (versus Free dopamine group).
