"Scientists at Binghamton University in New York sequenced the genomes of 35 residents of the remote equatorial islands of Melanesia and compared them to DNA extracted from ancient remains of Denisovans and Neanderthals... The genetic overlap of between the ancient hominids and modern Melanesians measured between 1.9 and 3.4 percent... The latest evidence suggests modern humans and early human relatives interbred on at least three separate occasions."
Via UPI - http://www.upi.com/Science_News/2016/03/17/Ancient-DNA-fragments-found-in-modern-humans/7591458241503/?spt=mps&or=5&sn=sn
Full paper in Science Magazine: http://science.sciencemag.org/content/early/2016/03/16/science.aad9416.full