Assertion: thymus's tissue | /r/HasProperty | replaced by fat
Facets:
value: gradually
type: MANNER
Source sentences:
text: It is quite large immediately after a child is born and has a maximum weight when the child reaches puberty, at which time his tissue is replaced by fat.
text: Normally, the thymus gland grows until puberty, when it begins to reduce in size, with the tissue being replaced gradually by fat as one gets older.