title: The human foetal yolk sac. An ultrastructural study offour specimens.
mesh_terms: D003594:Cytoplasmic Granules; D004707:Endoderm / Q000166:cytology* / Q000502:physiology; D004721:Endoplasmic Reticulum; D004847:Epithelial Cells; D004912:Erythrocytes; D005321:Extraembryonic Membranes / Q000166:cytology* / Q000502:physiology; D005260:Female; D006003:Glycogen; D006410:Hematopoiesis; D006652:Histological Techniques; D006801:Humans; D008264:Macrophages; D008648:Mesoderm / Q000166:cytology* / Q000378:metabolism / Q000502:physiology; D008854:Microscopy, Electron; D011247:Pregnancy
chemical_list: D006003:Glycogen