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The as-fabricated microfluidic chip and the micropillar arrays. (A) Global view of a bonded chip. The right figure shows a microscopic image of the micropillars aligned in the center of the microchannel. (B) Cross-section of the microfluidic chip, showing a membrane sandwiched by two microchannel layers. The right is a zoom-in image of the micropillars on a membrane. (C) SEM pictures of three kinds of micropillar arrays, namely small microwells, middle microwells, and large microwells.
