Assertion: bse | /r/CreatedBy | protein
Facets:
Source sentences:
text: Most scientists think that BSE is caused by a protein called a prion.
text: The complete nature of this disease is not fully understood, but scientists believe it is caused by a protein called a prion rather than some kind of bacterial infection or virus.
text: Most scientists think that BSE is caused by a protein called a prion.
text: Most scientists think that mad cow disease is caused by a protein called a prion.