Assertion: bilberry's level | /r/HasProperty | interaction
Facets:
value: between origin
type: LOCATION
value: between year
type: TEMPORAL
Source sentences:
text: Level of antioxidant activity did not differ between years, but there was an interaction between year and origin where the Northern clones showed highest levels in 2009, while the Southern clones had highest levels in 2008 (= 0.005).