Some suggestions concerning vertebrate visual cells.
D000663:Amphibians; D000717:Anatomy, Comparative; D000818:Animals; D005075:Biological Evolution; D001717:Birds; D008116:Lizards; D008394:Marsupialia; D008854:Microscopy, Electron; D010786:Photoreceptor Cells / Q000166:cytology / Q000502:physiology*; D012104:Reptiles; D012911:Snakes; D009626:Terminology as Topic