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. 2021 Jul 9;8:1412–1418. doi: 10.1016/j.toxrep.2021.07.002

Fig. 4.

Fig. 4

Effect of cumulative concentrations of (A) HAuCl4 and (B) AuNPs (0.1, 1.0, 10, and 100 μg/mL) on the muscle tone of isolated rings of female rat trachea, respectively. Representative trace of three independent experiments.