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The principle of deterministic lateral displacement (DLD). (A) Three fluid streams (represented by red, yellow, and blue) enter the three lanes (represented by 1, 2, and 3, from left to right, respectively) at the first obstacle row. Small particles will follow the streamlines and fall repeatedly into the same lane. (B) Big particles travel laterally as they enter the next row of obstacles. Image reproduced with permission from ref. 11.
