Assertion: xylem's cell | /r/HasProperty | tracheids and vessel elements
Facets:
Source sentences:
text: Parenchyma cells can occur within xylem tissue, but the more identifiable cells are tracheids and vessel elements, which tend to retain a red stain.
text: The xylem is composed of nonliving cells (tracheids and vessel elements) that are stiffened by the presence of lignin, a hardening substance that reinforces the cellulose cell wall.