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Blood Cells and Bone Marrow

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From The Biology of Prenatal Development.

Script: Teen 15 weke verskyn en vermenigvuldig bloedvormende stamselle in die beenmurg. Die grootste gedeelte van bloedsel-vorming sal hier plaasvind.

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

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Tooth Development Begins

Blood Cells and Bone Marrow

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Blood Cells and Bone Marrow

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3 months, 3 weeks