title: [Ultrastructural observations on the origin, amoeboid features and associations of human primordial germ cells (author's transl)].
mesh_terms: D002465:Cell Movement; D002478:Cells, Cultured; D004707:Endoderm / Q000648:ultrastructure; D005854:Germ Cells / Q000648:ultrastructure*; D005865:Gestational Age; D006801:Humans; D015017:Yolk Sac / Q000648:ultrastructure