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When impulse traffic in the A3–A4 connective was blocked, the frequencies of PS bursts in posterior ganglia were not higher than those of PS bursts in anterior ganglia when both were excited by 6 μm carbachol. Circles mark mean PS frequency, ± SD, recorded before the block was imposed (A1 - A6), while it was in place (A1 - A3, A4 - A6), and after the block was washed out (A1 - A6). n = 4 experiments.
