Research using the Syrian hamster have showed that a protein relevant to these agents has a glycosyl-linked membrane anchor. Both the number of Peyer's patches and the existence of B cells affect the susceptibility to them. PSI+ and URE3 are strains of these agents found in S. cerevisiae, and their only non-mammalian examples are found in funguses. The mutated Sc isoform of (*) PrP is the only mammalian strain of this agent and leads to the deposition of amyloid plaques in the brain. These agents which were identified by Stanley Prusiner cause 
Research using the Syrian hamster have showed that a protein relevant to these agents has a glycosyl-linked membrane anchor. Both the number of Peyer's patches and the existence of B cells affect the susceptibility to them. PSI+ and URE3 are strains of these agents found in S. cerevisiae, and their only non-mammalian examples are found in funguses. The mutated Sc isoform of (*) PrP is the only mammalian strain of this agent and leads to the deposition of amyloid plaques in the brain. These agents which were identified by Stanley Prusiner cause a disease responsible for tremors and ataxia endemic in Papua New Guinea and a transmissible spongiform encephalopathy in CreutzfeldtJakob disease. For 10 points, name these misfolded proteins which can cause mad cow disease.
Research using the Syrian hamster have showed that a protein relevant to these agents has a glycosyl-linked membrane anchor.
prions [or proteinaceous infectious particles]