The development of capillaries in the villi of early human placentas.
D000029:Abortion, Legal; D002196:Capillaries / Q000254:growth & development*; D002454:Cell Differentiation; D005260:Female; D005865:Gestational Age; D006801:Humans; D008854:Microscopy, Electron; D008938:Mitosis; D010920:Placenta / Q000098:blood supply* / Q000166:cytology; D011247:Pregnancy