Genes affecting keratin were found to have been introgressed from Neanderthals into modern humans (shown in East Asians and Europeans), suggesting that these genes gave a morphological adaptation in skin and hair to modern humans to cope with non-African environments.
Otkrilo se da su gene koji utječu na keratin neandertalci introgredirali u moderne ljude (utvrđeno u Istočnih Azijaca i Europljana), što sugerira da su ti geni omogućili modernim ljudima morfološku adaptaciju njihove kože i kose da se mogu nositi s neafričkim okolišima.