Assertion: xylem's cell | /r/CapableOf | form rays perpendicular
Facets:
value: to the surface of the organ
type: TRANSITIVE-OBJECT
Source sentences:
text: Radial parenchyma cells form rows or rays perpendicular to the surface of the organ, whereas axial parenchyma cell groups are arranged longitudinally in the xylem, being more abundant in the secondary xylem (see below).