Assertion: red sea urchin | /r/HasProperty | harvested for example
Facets:
value: in the united states
type: LOCATION
Source sentences:
text: In the United States, for example, red sea urchin, Strongylocentrotus francis-canus, purple sea urchin, S. purpuratus, and green urchin, S. droebachiensis, are harvested for their roe.