Assertion: bat's virus | /r/HasProperty | subtype
Facets:
value: until the discovery of these viruses
type: TEMPORAL
Source sentences:
text: A viruses have hemagglutinin (HA) surface proteins, and until the discovery of these viruses, there were only 16 different classes (or “subtypes”) of HA proteins known to exist in nature.
text: A viruses have hemagglutinin (HA) surface proteins, and until the discovery of these viruses, there were only 16 different classes (or “subtypes”) of HA proteins known to exist in nature.