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The inhibitory effect of AE-COS on A549 cell proliferation. The cells were treated with various concentrations of AE-COS for 24 h. (A) Cell viability was assessed via the MTT method. (B) The representative images of the cells were assessed by light microscopy (magnification, × 10). Each determination was made in triplicate, and the data were expressed as means ± SD. Different letters a–d indicate significant difference among groups (p < 0.05). Blank: No addition of AE-COS.
