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Figure 5 | Molecular Cytogenetics

Figure 5

From: On the origin of trisomy 21 Down syndrome

Figure 5

Changes in human oocyte number during prenatal and postnatal development. There is a very rapid increase in human female germ cell (oocyte) number early during fetal development with a peak at 7 months gestational age, followed by a relatively rapid decline before birth and postnatally before puberty, but a slower depletion during reproductive years until menopause

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