Assertion: cell wall's layer | /r/MadeOf | lignin
Facets:
value: in xylem cell walls
type: LOCATION
Source sentences:
text: More layers may be added containing lignin in xylem cell walls, or containing suberin in cork cell walls.
text: More layers may be added containing lignin in xylem cell walls, or containing suberin in cork cell walls.
text: More layers may be added containing lignin in xylem cell walls, or containing suberin in cork cell walls.