Assertion: comfrey's chemical | /r/Synonym | pyrrolizidine alkaloids
Facets:
Source sentences:
text: Even though this plant contains poisonous chemicals called pyrrolizidine alkaloids (PAs), the leaf, root, and root-like stem (rhizome) are used to make medicine.
text: All species of comfrey contain chemicals called pyrrolizidine alkaloids (PAs) (see the discussion above on Coltsfoot, and Chapter 4).
text: It also has poisonous chemicals called pyrrolizidine alkaloids.