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Representative trace recordings showing the effects of atropine (ATR, 1 μM) or UK-14,304 (1 μM) on the contractile activity of longitudinal smooth muscle evoked by transmural electrical stimulation (0.5 ms, 5 Hz, 30 mA, 25 pulses every 60 s) of ileal (a–d) or colonic preparations (e–h), obtained from rats either in the absence (a,b,e,f) or in the presence (c,d,g,h) of DNBS-induced colitis.
