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Red Blood Cells Fetal Erythropoiesis and Changes in Erythropoiesis After Birth Rapid growth during fetal development demands a brisk pace for red blood cell production, and this capacity must expand with the increase in blood volume, which is proportionate to…
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…