A strange signal in ancient and modern human DNA suggests the ancestors of Neanderthals and Denisovans must have mated with an unknown species of human
Source:
https://www.newscientist.com/article/2206003-mystery-hominin-had-sex-with-ancestors-of-neanderthals-and-denisovans/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home