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Cell sorting by optical force switching. A) When scattering forces (FS) exceed gradient forces (FG) from a focused laser beam, cells are deflected (left); however, when FG exceeds FS, cells are optically trapped (right).61 B) A hydrodynamically focused stream of cells is aligned toward the waste outlet whereupon cells of interest detected by laser inspection are captured and displaced by optical tweezers for sorting.68
