Ca2+ and photoreceptor adaptation.
D000200:Action Potentials; D000222:Adaptation, Physiological; D000818:Animals; D002118:Calcium / Q000378:metabolism / Q000494:pharmacology*; D003600:Cytosol / Q000378:metabolism; D003623:Dark Adaptation; D010786:Photoreceptor Cells / Q000187:drug effects* / Q000502:physiology
D002118:Calcium