Assertion: testis's germ cell | /r/HasProperty | arrested as t1 prospermatogonia
Facets:
value: until after birth
type: TEMPORAL
Source sentences:
text: The testis cords (orange) containing the Sertoli cells and the germ cells (which are arrested as T1 prospermatogonia until after birth) later differentiate into seminiferous tubules which become hollow and actively produce spermatazoa during puberty.