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Images of the setup used. (a) Photograph of the setup (glass chip, Teflon chip holder, pogo pins connector, and Transwell insert). (b) Cross-sectional drawing of the setup. Teflon holder (II) was made to suspend the membrane of Transwell insert (III) 3 mm above the glass chip (I), with O-ring (IV) to seal the electrochemical cell. The cells were cultured on the top (apical) side of the membrane.
