Researchers compared the Neanderthal DNA to the DNA of three modern people (French, Han Chinese, Polynesian). The team found that all three had inherited between 1 and 4 percent of their DNA from Neanderthals. They also compared the Neanderthal sequence to two African individuals (Yoruba, San) and found no indication that they had inherited genes from Neanderthals, who evolved outside Africa. The research supports the idea that Neanderthals interbred with Homo sapiens between 100,000 and 80,000 years ago as our anatomically modern ancestors left Africa and spread across the globe, as we can read from http://www.archaeology.org/1101/topten/germany.html
See also http://stretchingtheboundaries.blogspot.com/2010/12/human-all-too-human.html