title: The nature and identity of the internal excitational transmitter of vertebrate phototransduction.
mesh_terms: D000818:Animals; D002118:Calcium / Q000502:physiology; D006152:Cyclic GMP / Q000502:physiology; D006801:Humans; D008027:Light; D010786:Photoreceptor Cells / Q000502:physiology*; D014785:Vision, Ocular
chemical_list: D006152:Cyclic GMP; D002118:Calcium