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(a) Five-channel microfluidic cartridge device (scale bar: 5 mm for left, 1 mm for right); (b) Monocolor and multicolor droplet array printed on planar substrate (scale bar: 1 mm); (c) Multiplexed droplet-based micropatterns (MiNI logo, smiley and sad faces, and Tetris blocks, scale bar: 1 mm).
