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Images of differing microfluidic switches to prove the concepts of flow control: (a1)-(a3) simple On/Off switches; (b1)-(b3) the selector switches for choosing between two competing inlets and outlets: (c) mixing switch for combining two inlet flows into a single outlet. Reprinted with permission from Ballerini et al., Biomicrofluidics 5, 014105 (2011). Copyright 2011 American Institute of Physics.
