When did the ANS lineage diverge from the populations ancestral to modern East Asians and Europeans?

The 2019 study estimated that the ancestors of the Yana individuals diverged from East Asians around 38,000 years ago.

But this estimate carries uncertainty, and different modeling approaches might produce somewhat different dates.

The more precise dating of this divergence would constrain models of the population movements that produced the ANS.

What was the ecological basis of the ANS expansion into the far Arctic?

The Yana community was subsisting primarily on Mammoth Steppe megafauna.