Assertion: radioactive tracer | /r/ObjectUse | used in human studies
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: While radioactive tracers are sometimes still used in human studies, stable isotope tracers such as 13C are more commonly used in current human clamp studies.
text: While radioactive tracers are sometimes still used in human studies, stable isotope tracers such as 13C are more commonly used in current human clamp studies.