Assertion: collagen's structure | /r/CapableOf | act as nucleator
Facets:
value: for the formation of apatite crystal
type: PURPOSE
Source sentences:
text: HA film also show deposits of hydroxyapatite on the collagen fibers forming larger bundles and suggesting that a collagenous structure of reconstituted collagen fibers could act as nucleators for the formation of apatite crystal similar to those of bone.