Siberia: Recent studies of the DNA of Denisova Hominin showed these ancient sub species homo-sapiens bred with Neanderthals and the more more type of homo-sapien 40,000 years ago. Home-erectus was our common ancestor about 1 million years ago. Modern Aborginese in the South Pacific show common DNA, about 17%, with the Denisova. see wikipedia National Geographic articles
The Wt. and YEC groups always had a little trouble with Neanderthal DNA and viruses showing up in modern humans.