title: Sodium and potassium concentration gradient in the retinal rod outer segment.
mesh_terms: D000818:Animals; D001001:Anura; D001692:Biological Transport; D002462:Cell Membrane / Q000032:analysis; D003593:Cytoplasm / Q000032:analysis; D005615:Freezing; D006651:Histocytochemistry; D008854:Microscopy, Electron; D010786:Photoreceptor Cells / Q000032:analysis*; D011188:Potassium / Q000032:analysis*; D011896:Rana temporaria; D012964:Sodium / Q000032:analysis*; D013194:Staining and Labeling
chemical_list: D012964:Sodium; D011188:Potassium