Assertion: epidermis's type | /r/CapableOf | invaginate hole
Facets:
value: on the surface of the blastula
type: LOCATION
value: during the process of gastrulation
type: TEMPORAL
Source sentences:
text: During the process of gastrulation, a special type of cells called bottle cells invaginates a hole on the surface of the blastula which is called the dorsal lip of the blastopore.