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Typical tracings showing smooth muscle relaxations produced by electrical field stimulation (EFS, at arrows) and [Sar9]SP sulfone (1 μM) in: (a) human isolated corpus spongiosum precontracted with KCl (16 mM) before and after addition of SR 140333 (1 μM), and (b) human isolated corpus cavernosum precontracted with KCl (16 mM) before and after addition of Nω-nitro-L-arginine (L-NOARG, 100 μM).
