The ratio between the second and fourth digits is a sexually dimorphic measure, established in utero and linked to prenatal sex steroid levels. An association was found between prenatal levels of Polybrominated Biphenyls, a synthetic chemical suspected to disrupt the endocrine system function, and the digit ratio in adult women.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5578450 | PMC |
| http://dx.doi.org/10.1016/j.earlhumdev.2016.07.004 | DOI Listing |
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