This article summarizes a study published a couple days ago in Science Advances which examines interbreeding episodes between ancient humans, Neanderthals and Denisovans. The study includes evidence of a previously unknown interbreeding event 700,000 years ago between a population of humans that became isolated from other human populations 2 million years ago and the ancestors of Neanderthals and Denisovans.
An evolutionary tree including four proposed episodes of gene flow. The previously unknown event 744,372 years ago (orange) suggests interbreeding occurred between super-archaics and Neanderthal-Denisovan ancestors in Eurasia. Credit : Alan Rogers
I thought it might be interesting to some of you who like to keep up with such things.