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Photographs of sensor-integrated Transwell™ plates. TEER measurement set-up by circular transparent electrodes with FPC-to-DIP adapters (a). Ion-selective flexible sensors inserted in transwell plate, one for each compartment (top and bottom) of the well; each sensor can measure two different ions with a common thin film Ag/AgCl reference electrode (black electrode on flex between the two working electrodes) (b).
