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Mean log concentration-response curves for the enhancing effect of acetylcholine (in the absence of physostigmine) and carbachol on field stimulation (trains of 20 pulses of 0.5 ms at 10 Hz every 50 s, 60 V)-induced contractions of the guinea-pig prostatic preparations. Data are shown as mean values with vertical lines representing s.e.mean from 16 experiments.
