title: An experimental examination of the scrapie agent in cell membrane mixtures. 3. Studies of the operational size.
mesh_terms: D000818:Animals; D001921:Brain / Q000382:microbiology; D002462:Cell Membrane / Q000382:microbiology*; D002499:Centrifugation, Density Gradient; D002845:Chromatography; D002850:Chromatography, Gel; D051379:Mice; D008854:Microscopy, Electron; D009696:Nucleic Acids / Q000032:analysis; D011328:Prions / Q000302:isolation & purification*; D011506:Proteins / Q000032:analysis; D014465:Ultrasonics; D014732:Vibration
chemical_list: D009696:Nucleic Acids; D011328:Prions; D011506:Proteins