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Blood Cells and Bone Marrow

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From The Biology of Prenatal Development.

Script: A la semana 15, las células progenitoras sanguíneas llegan a la médula ósea y se multiplican. La mayor parte de la formación de sangre ocurrirá 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