Assertion: prion | /r/HasProperty | agent
Facets:
Source sentences:
text: Prions, the agents causing transmissible spongiform encephalopathies, colonize the brain of hosts after oral, parenteral, intralingual, or even transdermal uptake.
text: Whether prions are the agent which causes disease or merely a symptom caused by a different agent is still debated by a minority of researchers.