Assertion: osteoblast | /r/CapableOf | invade the centre of the shaft
Facets:
value: at the same time
type: TEMPORAL
Source sentences:
text: At the same time the osteoblasts, together with capillaries, invade the centre of the shaft to form a primary, or diaphyseal ossification centre, at a site where the cartilage cells and matrix have begun to disintegrate.