title: Electron microscopy analysis of differentiation of the wall and capillary bed of the chick embryo allantochorion.
mesh_terms: D000818:Animals; D002196:Capillaries / Q000196:embryology / Q000648:ultrastructure*; D002642:Chick Embryo; D002823:Chorion / Q000098:blood supply / Q000648:ultrastructure*; D005321:Extraembryonic Membranes / Q000648:ultrastructure*; D008854:Microscopy, Electron