Scientists have controversially claimed the discovery of gene variants which directly influence whether we walk upright or on all fours.
Two of four Turkish families with members who walk on their hands and feet share a variant of the VLDLR gene, say Bilkent University researchers.
Presenting their work at a European genetics conference, they said it could reveal clues about human evolution.
But other experts said the idea of an "all fours gene" was "far-fetched".
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| The families do not walk on two feet
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Comment: The long-term health effects of wireless technology are still in doubt and the potential abuse of the predicted technology is unthinkable.