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Ancient DNA shaped our immune system

Modern humans (Homo sapiens) arose in Africa and migrated to Europe and Asia where they displaced resident archaic humans such as Neanderthals and Denisovans. Sequencing of archaic human genomes shows that interbreeding occurred between these different human species. Now new research shows that interbreeding introduced beneficial immune genes contributing to the hybrid vigour that allowed Homo sapiens to colonise the world.

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