title: Pineal photoreceptors: evidence for a vertebrate visual pigment with two physiologically active states.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D001001:Anura; D066298:In Vitro Techniques; D008274:Magnesium / Q000494:pharmacology; D010786:Photoreceptor Cells / Q000502:physiology*; D010870:Pineal Gland / Q000166:cytology / Q000502:physiology*; D012168:Retinal Pigments / Q000502:physiology*; D012964:Sodium / Q000494:pharmacology
chemical_list: D012168:Retinal Pigments; D012964:Sodium; D008274:Magnesium