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Relaxant responses in mouse oesophageal muscle of (a) CL 316,243 and (b) (−)-CGP 12177 in the absence or presence of 10 μM SR 59230A. All experiments were carried out in the presence of 200 nM (−)-propranolol. Values shown are mean±s.e.mean (vertical lines, where larger than symbol size), n=8–11 tissues for each curve.
