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(a) Migrating trajectory of a CL1-5 cell in a 0.5 μM/mm EGF concentration gradient with the modulation of a 540 mV/mm EF in a square waveform. (b) Migrating trajectory of an A549 cell in the same conditions as those in (a). The CL1-5 cell exhibits an anodal electrotaxis, while the A549 cell migrates toward the cathode.
