title: Haemopoietic precursor cells in early human embryos: light microscopic pictures.
mesh_terms: D004622:Embryo, Mammalian; D004920:Erythropoiesis; D005260:Female; D005865:Gestational Age; D006412:Hematopoietic Stem Cells; D006801:Humans; D008099:Liver / Q000166:cytology; D013194:Staining and Labeling; D014817:Vitelline Membrane / Q000166:cytology