Assertion: fluoride | /r/Causes | a 25% decrease
Facets:
value: in test tubes
type: LOCATION
value: in animal experiments
type: LOCATION
Source sentences:
text: A study in Portugal revealed that fluoride at 1ppm concentration caused a 25% decrease in activitiy of the enzyme succinic dehydrogenase in liver tissue, both in test tubes and in animal experiments.