Suppression of the frog's cone system in the dark.
D000221:Adaptation, Ocular; D000818:Animals; D001001:Anura; D003116:Color; D003623:Dark Adaptation; D004596:Electroretinography; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology*; D011894:Rana pipiens