title: X-ray studies on nerve and photoreceptors.
mesh_terms: D000818:Animals; D008566:Membranes / Q000032:analysis; D008961:Models, Structural; D009186:Myelin Sheath / Q000032:analysis*; D009900:Optic Nerve; D010786:Photoreceptor Cells / Q000032:analysis; D011892:Rana catesbeiana; D011894:Rana pipiens; D012168:Retinal Pigments / Q000032:analysis; D012584:Sciatic Nerve; D014961:X-Ray Diffraction
chemical_list: D012168:Retinal Pigments