In addition to identifying Neanderthal ancestry in African populations, the researchers described two revelations about the origin of the Neanderthal sequences. First, they determined that the Neanderthal ancestry in Africans was not due to an independent interbreeding event between Neanderthals and African populations.
And the second "revelation" is?
Based on features of the data, the research team concluded that migrations from ancient Europeans back into Africa introduced Neanderthal ancestry into African populations.
Which would fit in with
- hominids evolved in Africa
- some hominids left Africa (for Asia, and Europe)
- Asian population evolved distinct "neanderthal" dna changes
via the - now, neanderthal-containing - hominids going "back to Africa", and getting jiggy