system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Are modern humans pure homo-sapiens?

Or are we a mix of Homo-sapiens, Denisovans, and other pre modern humans? And can you explain the differences of them and when they went their separate ways to the different continent?
gpt
If you can trace your ancestry to somewhere other than Africa, you have trace Neanderthal DNA, up to 4% by conservative estimates and 10% by more extreme ones. We interbred with them after we left Africa, so therefore people who can trace themselves back to that continent would lack this admixture. You also mentioned Denisovans. Traces of their DNA have been found in some human populations as well.