Assertion: guinea pig | /r/ObjectUse | used in experiment
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Well, guinea pigs are often used in experiments because they have biological similarities to humans, which makes them useful in many fields of research.
text: Guinea pigs have been used in experimentations way back since the 17th century, so this small rodent played a major role in the establishment of the germ theory in the late 19th century.