title: Ultrastructure of fetal hemopoiesis.
mesh_terms: D001853:Bone Marrow / Q000196:embryology / Q000648:ultrastructure; D004912:Erythrocytes / Q000648:ultrastructure; D005333:Fetus / Q000502:physiology*; D005865:Gestational Age; D006410:Hematopoiesis; D006801:Humans; D008099:Liver / Q000196:embryology / Q000648:ultrastructure; D015017:Yolk Sac / Q000196:embryology / Q000648:ultrastructure