title: Light-induced changes in cAMP levels in Limulus photoreceptors.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D000242:Cyclic AMP / Q000378:metabolism*; D006152:Cyclic GMP / Q000378:metabolism; D003623:Dark Adaptation; D006737:Horseshoe Crabs / Q000502:physiology*; D008027:Light; D010786:Photoreceptor Cells / Q000378:metabolism* / Q000528:radiation effects
chemical_list: D000242:Cyclic AMP; D006152:Cyclic GMP