title: Origin of non-linearity of voltage--current relationships of turtle cones.
mesh_terms: D000200:Action Potentials; D000818:Animals; D005246:Feedback; D066298:In Vitro Techniques; D008564:Membrane Potentials; D008954:Models, Biological; D010786:Photoreceptor Cells / Q000502:physiology*; D014426:Turtles / Q000502:physiology*