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Trapping, transport and fusion of microspheres in an ATPS consisting of dextran and PEG. (a) The upper phase contained dextran-rich microspheres in a PEG-rich exterior solution. (b) The lower phase contained PEG-rich microspheres in a dextran-rich exterior solution. In both cases, microspheres were successfully fused. Times after trapping are indicated. The focus point of the laser is marked by crosses as a guide. Dextran and PEG are 1.5% and 7% PEG, respectively. Bar: 10 µm.
