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(a) Photomask design of a microfluidic device (serp-22-1-2) with a 22-cm serpentine separation channel and two 180° turns with taper ratio 1. See Tables 1 and 2 for device dimensions and details. White light images of asymmetrically tapered, 180° turns with taper ratios (b) 1, (c) 2, and (d) 3.
