https://www.science.org/doi/10.1126/sciadv.aax5097
Which sheds strong doubt on the 'out of Africa' theory whereby anatomically modern Blacks left Africa and magically became Whites and Asians which, if correct, would mean that Asians and Whites also carry at least some of the "ghost" DNA, which they don't("ghost" DNA is speculatively Homo erectus but no H.e. DNA yet exists for comparison). Not only that, but the newer revelation that sub-Saharan Africans do, after all, have traces of Neanderthal DNA, which Whites and Asian have a much higher percent of, would more likely indicate that some anatomically modern Whites and/or Asians migrated, at some point, back to Africa and mated with the ghost species resulting in modern Blacks who, as a result, now have a much lower percentage of "ghost species" DNA, which is, as noted, totally absent in Whites and Asians.