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Photo of trapped cells in cDEP devices. Direction of fluid flow is from top to bottom, while electric field is applied horizontally. (a) High density of cell suspension in a device with large (100 μm) pillars results in pearl-chaining and unspecific trapping. (b) In a device with small 20 μm pillars only one or two cells can trap on each pillar. When saturated, excessive cells will not accumulate, but continue to next available location.
