Cell migration ability was assessed by the wound healing experiment as previously described [20]. Briefly, A549 and H661 cells were plated in six-well plates and cultured under different conditions for 24 h. A linear scratch was generated on the cell monolayer using a pipette tip. Photographs of cells were taken by a microscope (Nikon) at ×40 magnification, and the cell migration was assessed by wound closure.
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