Abstract
For a long time the yolk sac was characterized as the main source of hematopoietic stem cells (HSC), since it was the first place to be seen this type of activity. However, more recent evidence suggests that repopulation of CTH is autonomically generated in a region in the embryonic mesoderm, known as the aorta-gonad-mesonephric region (AGM). AGM region is located near the urogenital syst…