Assertion: neuroepithelium's cell | /r/CapableOf | move through the dorsal blastopore lip
Facets:
value: at the onset of gastrulation
type: TEMPORAL
Source sentences:
text: At the onset of gastrulation presumptive mesodermal cells move through the dorsal blastopore lip and form a layer in between the endoderm and the ectoderm.