Assertion: skull's bone | /r/MadeOf | two pieces
Facets:
value: at birth
type: TEMPORAL
value: by the eighth year
type: TEMPORAL
Source sentences:
text: At birth the bone consists of two pieces, separated by the frontal suture, which is usually obliterated by Intramembranous ossification, except at its lower part, by the eighth year, but occasionally persists throughout life.