title: Ultrastructural studies of protein transfer across rodent yolk sac.
mesh_terms: D000818:Animals; D004705:Endocytosis; D004848:Epithelium / Q000378:metabolism; D005260:Female; D005865:Gestational Age; D007793:Lagomorpha / Q000378:metabolism; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D011506:Proteins / Q000378:metabolism*; D012377:Rodentia / Q000378:metabolism*; D015017:Yolk Sac / Q000502:physiology* / Q000648:ultrastructure
chemical_list: D011506:Proteins