Assertion: skull's bone | /r/CapableOf | become united
Facets:
value: at the skull sutures
type: LOCATION
value: gradually
type: MANNER
value: between the 18th and 25th years
type: TEMPORAL
Source sentences:
text: Between the 18th and 25th years the occipital and sphenoid bone become united, forming a single bone.
text: Bones of the skull and skull base - frontal, parietal, occipital, ethmoid, sphenoid and temporal bones - all ossify separately and gradually become united at the skull sutures.