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  • Title: The response of the isolated iris sphincter muscle of various mammalian species to substance P.
    Author: Unger WG, Tighe J.
    Journal: Exp Eye Res; 1984 Dec; 39(6):677-84. PubMed ID: 6083876.
    Abstract:
    Contractile responses of the isolated iris sphincter muscle from the rabbit, cow, pig, cat, dog, baboon and man to substance P were compared under isotonic conditions using carbachol as a reference standard. Iris preparations from the rabbit, pig and cow showed strong and consistent responses to substance P whilst those from the cat, dog, baboon and human eyes did not contract.
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