Assertion: embryo | /r/HasAspect | eight cells
Facets:
value: before implanting them
type: TEMPORAL
Source sentences:
text: The doctors fertilized the eggs in vitro, and waited until the fertilized eggs divided into eight cells before implanting them into the female uterus (up until the mid-1970s, they had waited until the fertilized egg divided into 100 cells before implantation).