Assertion: testis's germ cell | /r/CapableOf | migrate to gonad
Facets:
Source sentences:
text: Germ cells migrating to the gonads may not reach that intended destination and a tumor can grow wherever they end up, but the exact cause is still unknown.
text: These are made up of early Sertoli cells that surround and nurture the germ cells that migrate into the gonads shortly before sex determination begins.