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(a) Representative microscopic images of microchannels fabricated using a milling technique, captured with microscopy (IX71, Olympus Optical Co., Tokyo, Japan); (b) A cross-sectional view of microchannel depicted in (a); Scale bars indicate 50 μm in both (a,b). (c) A photograph of the prototype microchip with red ink in the negative microchannels bonded to a glass slide.
