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When a Girl Becomes a Woman: Menstruation Genes Found

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When a Girl Becomes a Woman: Menstruation Genes Found Every wonder why some girls get they're period as young as 7 years old, and ohers don't get it until they're almost 20? A new study suggests that genes, in combination with other factors, determine when a girl will reach the moment commonly referred to as the first sign of womanhood.

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