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Medical News Today: Left, right, or ambidextrous: What determines hand preference?

04:00 EDT 4 Aug 2017 | Medical News Today

The first signs of preferring one hand over the other start in the womb - as early as 9 weeks after conception - but genes may only play a minor role.

Original Article: Medical News Today: Left, right, or ambidextrous: What determines hand preference?

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