Assertion: lignin | /r/AtLocation | the cell walls of plants
Facets:
Source sentences:
text: Lignin is found in the cell walls of plants, and it is the most abundant natural aromatic polymer, constituting about 15 to 30% of wood and 12 to 20% of annual plants (Cateto et al.
text: Lignin, as the second most abundant polymer only to cellulose in nature, is a three-dimensional network polymer that is found in the cell walls of plants; it is the glue that adheres organic tissue together.