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Effect of increasing doses of (−)-tertatolol and (−)-penbutolol on the firing rate of 5-HT cells in the DRN. Basal firing rates were 16.3±2.5 (9) and 8.7±2.0 (9) spikes 10 s−1 in the groups treated with (−)-tertatolol and (−)-penbutolol respectively.
