title: Clasping structure in the double cone of the retina in vertebrates.
mesh_terms: D000818:Animals; D002645:Chickens / Q000033:anatomy & histology; D008854:Microscopy, Electron; D010786:Photoreceptor Cells / Q000648:ultrastructure*; D011898:Ranidae / Q000033:anatomy & histology; D014426:Turtles / Q000033:anatomy & histology