A study suggests that facial expressions may be hereditary.
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References
NevoE., et al. "Proc. Natl Acad. Sci":http://www.pnas.org/cgi/doi/10.1073/pnas.0607551103, 103. 15921 - 15926 (2006).
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Abid, A. Is your smile in your genes?. Nature (2006). https://doi.org/10.1038/news061016-2
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DOI: https://doi.org/10.1038/news061016-2