Which theory is most discounted by the finding that the HLA system was inherited from Neandertals and Denisovans?

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The single-origin theory, also known as the "Out of Africa" theory, posits that modern humans evolved in Africa and then dispersed, replacing other hominins without interbreeding. The finding that the HLA system was inherited from Neandertals and Denisovans suggests interbreeding, which contradicts the single-origin theory.

Which Theory Is Most Discounted by the Finding That the HLA