Assertion: embryo | /r/HasProperty | a cluster of 100-200 cells
Facets:
value: at the blastocyst stage
type: TEMPORAL
value: after fertilization
type: TEMPORAL
Source sentences:
text: At the blastocyst stage, five to 10 days after fertilization, the embryo is a cluster of 100-200 cells (it is sometimes called a pre-implantation embryo because in a pregnancy, a blastocyst has not yet implanted in the uterus).