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Immobilization of microspheres (18.8±1.2 μm in diameter) by the traps in the array. A: d=3 μm; B: d=10 μm; C: d=49 μm. Black arrows indicate trapped microspheres, and white arrows indicate those that pass by the traps. D. The occupancy rate of the traps in the arrays that vary in d from 3 to 49 μm.
