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Concentration-response curves of MGM-15 (A) and MGM-16 (B) for electrical stimulation–induced contraction in mouse vas deferens in the absence or presence of cyprodime (Cyp) and norBNI or Cyp, norBNI, and naltrindole (NTI). Responses are expressed as contraction % of the twitch contraction before agonist addition. Data represent mean ± S.E.M. of five animals.
