title: Electron microscopical observations on sheep umbilical vessels.
mesh_terms: D000818:Animals; D001485:Basement Membrane; D003593:Cytoplasm; D004727:Endothelium / Q000166:cytology; D005260:Female; D006652:Histological Techniques; D008854:Microscopy, Electron; D009130:Muscle, Smooth / Q000166:cytology; D011247:Pregnancy; D012756:Sheep; D014021:Tissue Preservation; D014469:Umbilical Arteries / Q000166:cytology*; D014471:Umbilical Veins / Q000166:cytology*