[Transport of substances through the placenta--electron microscopic observation].
D000818:Animals; D001692:Biological Transport; D005260:Female; D006651:Histocytochemistry; D008854:Microscopy, Electron; D010544:Peroxidases / Q000378:metabolism; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy; D051381:Rats; D013910:Thorium
D013910:Thorium; D010544:Peroxidases