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Influence of gradual replacement of sodium by choline on the 5-HT (2-min exposure)-evoked [14C]guanidinium influx above basal influx in N1E-115 cells. The responses are expressed as percentages of the effect elicited by 100 μM 5-HT using choline (135 mM) buffer (=reference); 100 % corresponds to 51 pmol × mg protein−1. Shown are means±s.e.m. of n=5–12 experiments.
