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Schematic of cross-section (A) and top-down view (B) of density-based oil drain microchip. Nanoliter volume droplets are pumped into the device (purple) and the low-density segmenting phase (yellow) drains to the top of the buffer filled reservoir (blue) where high voltage (HV) is applied. Aqueous droplets merge with the buffer and analytes are electrophoresed toward grounded reservoir (not shown).
