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Blood Cells and Bone Marrow


 

3 months, 3 weeks

Buy NowFrom The Biology of Prenatal Development.

Script: By 15 weeks, blood-forming stem cells arrive and multiply in the bone marrow. Most blood cell formation will occur here.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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Blood Cells and Bone Marrow
Blood Cells and Bone Marrow
( 3 months, 3 weeks)
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