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Whole cell recordings from CCK-GFP cells showing inhibition of K+ current activity by barium chloride and l-phenylalanine. A and B: membrane currents (pulse protocol in inset, holding potential −40 mV, step size 20 mV) and current-voltage (I-V) plots during control and exposure to 100 μM barium. C: average data from the I-V relationship from 5 cells. D and E: currents and I-V plot from another cell during control and exposure to 15 mM l-phenylalanine. F: average data from 5 cells.
