system
A chat on subreddit /r/NoStupidQuestions
human
Neanderthal DNA occurs most frequency Europeans. Neanderthal evolved in Europe, and their range was largely in Europe and northern/Central Asia. Most of the neanderthal DNA in homosapiens is related to the immune system.

The other Homo species in Asia was primarily Denisovans.

From phenotypic traits, neanderthal had much higher testosterone than modern humans.
gpt
East Asians have the most Neanderthal dna.  But yeah the reason they tend to have less body hair is lower DHT, not lower testosterone