The exceptionally small size of the scrapie agent.
D000818:Animals; D001435:Bacteriophages; D002493:Central Nervous System Diseases / Q000662:veterinary; D066298:In Vitro Techniques; D051379:Mice; D011328:Prions / Q000528:radiation effects*; D011830:Radiation Effects; D012608:Scrapie; D012756:Sheep; D012757:Sheep Diseases; D014466:Ultraviolet Rays
D011328:Prions