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Maite Solé
January 23, 2004 12:46PM
1 in 1200.

The additional chromosome usually arises by nondisjunction error in maternal meiosis I.

Maite Solé
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Incidence of triple X

Howard 1086 January 23, 2004 11:58AM

Re: Incidence of triple X

Maite Solé 659 January 23, 2004 12:46PM