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Fig. 7. Comparison of [3H]noradrenaline (3H-NA) release evoked by 57 mM and 110 mM K+-depolarization. (A) 3H-NA release evoked within 10 minutes of stimulation with 57 mM K+ or 110 mM K+. The bars show the average response (± s.d.) of three measurements in % of total radioactivity. (B) 3H-NA release induced within 20 minutes (black horizontal bar) of stimulation with 57 mM K+ and 110 mM K+ in superfused PC12 cells. Symbols show the average radioactivity (± s.d.) in superfusates collected every 4 minutes. Values were corrected for basal release, which was determined 12 minutes before membrane depolarization with K+.