title: Extraocular photoreception in amphibians.
mesh_terms: D000663:Amphibians; D000818:Animals; D002940:Circadian Rhythm; D003623:Dark Adaptation; D009474:Neurons / Q000648:ultrastructure; D010786:Photoreceptor Cells / Q000033:anatomy & histology / Q000502:physiology / Q000648:ultrastructure; D010870:Pineal Gland / Q000648:ultrastructure