Assertion: brain | /r/CapableOf | appear as three swellings
Facets:
value: in its earliest form
type: TEMPORAL
Source sentences:
text: In its earliest form, the brain appears as three swellings at the front end of the neural tube; these swellings eventually become the forebrain, midbrain, and hindbrain (the prosencephalon, mesencephalon, and rhombencephalon, respectively).