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Enzyme microreactor: Gel discs were formed with covalently linked alkaline phosphatase. Droplets containing fluorescein diphosphate were merged onto the discs and after incubation, the fluorescence of dispensed droplets was reported as a function of the concentration of fluorescein diphosphate. The experiments were replicated 3 times and error bars are ±1 S.D. A least squares line of best fit through the data has an R2 = 0.9929.
