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Summary1.The radula protractor ofRapana thomasiana consists of obliquely striated muscle fibers containing thick and thin… Expand The amino terminal functional unit (domain a) of the Rapana hemocyanin "heavy" structural subunit, designated as Rta, was… Expand 1. Mechanisms of antagonistic responses of the radular protractor and the retractor to the same neurotransmitters, octopamine and… Expand 1. The isolated ventricle of Rapana thomasiana requires the pressure of internal perfusion if it is to beat spontaneously. 2. A… Expand