UC Berkeley researchers reconstructing the ancestry of more than 500 living human genomes identified DNA from two unidentified human lineages: one that diverged from ours roughly 800,000 years ago and interbred with Homo sapiens in Africa before 50,0UC Berkeley researchers reconstructing the ancestry of more than 500 living human genomes identified DNA from two unidentified human lineages: one that diverged from ours roughly 800,000 years ago and interbred with Homo sapiens in Africa before 50,0 ScienceBlog.com