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Cyclic voltammograms of acetylcholine (ACh), tryptamine (T), and serotonin (5-HT) on a nanopipet electrode. (a) 2 mM acetylcholine transfer across a radius ≈7 nm interface in cell 1; scan rate = 0.05 V/s. (b) 2 mM tryptamine transfer across a radius ≈19 nm interface in cell 1; scan rate = 0.02 V/s. (c) 2 mM serotonin transfer across a radius ≈35 nm interface in cell 2; scan rate = 0.05 V/s. For comparison, the cyclic voltammogram of tetraethylammonium is shown in each overlay.
