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Hematologic and Oncologic Problems in the Fetus and Neonate
Human Hematopoietic Development Hematopoietic Stem Cells Blood cells arise from the differentiating embryonic mesoderm. Human erythroid and macrophage progenitor cells have been observed in the yolk sac by days 16-19 and at day 19 in the aortic-gonad-mesonephros (AGM). After the…