Assertion: comfrey's root | /r/MadeOf | more allantoin
Facets:
Source sentences:
text: (Young roots may contain more Allantoin.)
text: The underground roots contain allantoin 0.6% to 0.7% and tannin 4% to 6.5%; the leaves contain a higher proportion of tannin relative to allantoin.
text: (Roots do contain more Allantoin, perhaps twice as much.)