Spread of disease-protection genes points to cannibalistic past.
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References
Mead, S. et al. Balancing selection at the prion protein gene consistent with prehistoric kurulike epidemcis. Science, published online, doi:10.1126/science.1083320 (2003).
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Whitfield, J. Our ancestors had brains - for dinner. Nature (2003). https://doi.org/10.1038/news030407-13
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DOI: https://doi.org/10.1038/news030407-13