Structural changes in the murine yolk sac during gestation: cytochemical and electron microscope observations.
D000818:Animals; D004622:Embryo, Mammalian; D004707:Endoderm / Q000166:cytology*; D005260:Female; D006651:Histocytochemistry; D051379:Mice; D008854:Microscopy, Electron; D011247:Pregnancy; D011270:Pregnancy, Animal