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Blood Cells and Bone Marrow

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From The Biology of Prenatal Development.

Script: A les 15 setmanes, arriben les cèl·lules mares que formen la sang i es multipliquen a la medul·la òssia. La majoria de glòbuls es formaran aquí.

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

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Blood Cells and Bone Marrow

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3 months, 3 weeks