title: Cyclic GMP: control of concentration by light in retinal photoreceptors.
mesh_terms: D000221:Adaptation, Ocular; D000818:Animals; D000242:Cyclic AMP / Q000494:pharmacology; D006152:Cyclic GMP / Q000378:metabolism*; D003624:Darkness; D008027:Light; D010786:Photoreceptor Cells / Q000187:drug effects / Q000378:metabolism*; D011894:Rana pipiens; D014970:Xanthines / Q000494:pharmacology
chemical_list: D014970:Xanthines; D000242:Cyclic AMP; D006152:Cyclic GMP