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Blood Cells and Bone Marrow


3 months, 3 weeks

From The Biology of Prenatal Development.Buy Now

Script: 15주까지는 혈액을 형성하는 줄기세포가 출현하고 골수에서 번식한다 혈액세포 형성의 대부분이 여기에서 발생한다

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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