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What's triggering the chimpouts?

The technical answer is “archaic hominin genetic introgression in west african populations. “

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Look at the graphic from this study which analyzed varients of the MUC7 salivary protein. It suggests hybridization in yorubans with a species that diverge ~4.5 mya. That is close to the split with Pan. (Group E)

https://files.catbox.moe/vhnicu.jpeg

Archaic Hominin Introgression in Africa Contributes to Functional Salivary MUC7 Genetic Variation https://academic.oup.com/mbe/article/34/10/2704/3988100