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Blood Cells and Bone Marrow

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From The Biology of Prenatal Development.

Script: Eemvekeni ezi-15, amaseli akha iingazi ayafika(blood-forming stem cells) aziphindaphinde ngaphakathi kwethambo. Amaseli weengazi amanengi enzakala la.

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