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Representative images of MCF-7 cell migration under different FBS concentrations. (a–d) 1% FBS. (e–h) 10% FBS. (i–l) 20% FBS. The images were taken at 0, 12, 24, and 48 h. The lines indicate the initial leading edges at time 0 h and the migration edge after 12, 24, and 48 h. Error bars represent the SD from three different experiments on three devices (n = 3). P < 0.05. The scale bar in the picture represents 100 μm.
