Assertion: xylem's cell | /r/HasProperty | secreted
Facets:
Source sentences:
text: However, also plant defense responses can contribute to xylem occlusion, such as tyloses that are formed by the parenchyma cells and gum and gels that are secreted (Fradin and Thomma, 2006; Klosterman et al., 2009; Beattie, 2011).