Around 4,200 years ago, one particular lineage of horse quickly became dominant across Eurasia, suggesting that's when humans started to spread domesticated horses around the world, according to research published Thursday in the journal Nature.
That genetic diversity was evident in ancient DNA samples the researchers analyzed from archaeological sites across Eurasia dating back to 50,000 years ago. But their analysis of 475 ancient horse genomes showed a notable change around 4,200 years ago.
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