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Effect of carbenoxolone on contraction velocity. A: probability density of contraction velocities (see methods). Positive velocities correspond to distal-directed waves and negative velocities to proximal-directed waves. Values were calculated from 6 intestines, over 2 min per intestine, with bins of 0.05 cm/s. B: mean and mode negative velocities. **P < 10−2, ***P < 10−3, ****P < 10−4 vs. control (by paired t-test).
