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The Endowment for Human Development
The Endowment for Human Development
Improving lifelong health one pregnancy at a time.
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Right- and Left-Handedness


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: Alkioista 75 prosenttia osoittaa oikeakätisyyttä viikolla 8. Muut jakautuvat tasan vasenkätisyyden ja molempikätisyyden välillä. Tämä on varhaisin todiste oikea- ja vasenkätisyydestä.

All ages referenced to fertilization, not last menstrual period.
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