title: Lowering the ratio of extracellular calcium to sodium mimics the effect of light on the photosensory membrane of Limulus ventral nerve photoreceptor.
mesh_terms: D000818:Animals; D003386:Brachyura / Q000502:physiology*; D002118:Calcium / Q000494:pharmacology* / Q000502:physiology; D004553:Electric Conductivity; D066298:In Vitro Techniques; D008027:Light; D008564:Membrane Potentials / Q000187:drug effects; D010786:Photoreceptor Cells / Q000502:physiology*; D012964:Sodium / Q000494:pharmacology* / Q000502:physiology
chemical_list: D012964:Sodium; D002118:Calcium