Proceedings: The sphincter pupillae: contractions in Ca2+-free solution.
D000818:Animals; D002118:Calcium / Q000502:physiology; D006168:Guinea Pigs; D066298:In Vitro Techniques; D007498:Iris / Q000502:physiology; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000502:physiology*; D011680:Pupil
D002118:Calcium