title: AN ELECTRON MICROSCOPIC CLASSIFICATION OF THE RETINAL RECEPTORS OF THE LEOPARD FROG (RANA PIPIENS).
mesh_terms: D000818:Animals; D001001:Anura; D004583:Electrons; D006664:History; D008853:Microscopy; D008854:Microscopy, Electron; D011894:Rana pipiens; D011898:Ranidae; D012106:Research; D012160:Retina; D012168:Retinal Pigments; D011984:Sensory Receptor Cells
chemical_list: D012168:Retinal Pigments
keywords: EXPERIMENTAL LAB STUDY; FROGS; HISTORY; MICROSCOPY, ELECTRON; RECEPTORS, NEURAL; RETINA; RETINAL PIGMENTS