A flow cytometry system includes an inertial particle focusing device including a plurality of substantially parallel microchannels formed in a substrate, each microchannel having a width to height ratio in the range of 2:3 to 1:4, an analyzer disposed adjacent the inertial particle focusing device such that the analyzer is configured to detect a characteristic of particles in the inertial particle focusing device, and a controller connected to the analyzer and configured to direct the detection of the characteristic of the particles.
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