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Horm Behav. 2006 Mar;49(3):315-9. Epub 2005 Sep 6.

Finger-length ratios show evidence of prenatal hormone-transfer between opposite-sex twins.

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  • 1Department of Psychology, Simon Fraser University, Burnaby BC, Canada.


Finger-length ratio (second to fourth finger; 2D:4D) has been associated with various measures thought to be related to prenatal androgens. In addition, hormone-transfer theory posits that hormones can transfer between twins. We examined 2D:4D in same-sex (SS) and opposite-sex (OS) dizygotic twins to test both propositions. Results show that 2D:4D is masculinized in OS females compared to SS females. This provides strong evidence that 2D:4D is laid down prenatally, and that hormones (likely androgens) can transfer from male to female fetuses. Implications for developmental timeframes for both hormone-transfer and 2D:4D are discussed.

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