Origin and early migration of primordial germ cells in the chick embryo: a study of the stages definitive primitive streak through eight somites.
D000818:Animals; D003585:Cell Biology; D002454:Cell Differentiation; D002465:Cell Movement; D002642:Chick Embryo; D004622:Embryo, Mammalian; D004625:Embryo, Nonmammalian; D004707:Endoderm; D005854:Germ Cells; D006651:Histocytochemistry; D008722:Methods