Testosterone sharing in the womb has knock-on effects.
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References
Lummaa V., Pettay J. E. & Russell A. F. Proc. Natl Acad. Sci. USA, doi:10.1073/pnas.0605875104 (2007).
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Fairless, D. Twin brothers make women less fertile. Nature (2007). https://doi.org/10.1038/news070618-3
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DOI: https://doi.org/10.1038/news070618-3