Interbreeding between archaic and modern humans been shown that Neanderthal ancestry has been selected against in conserved biological pathways, such as RNA processing. Consistent with the hypothesis that purifying selection has reduced Neanderthal contribution in present-day modern human genomes, Upper Paleolithic Eurasian modern humans (such as the Tianyuan modern human) carry more Neanderthal DNA (about 4–5%) than present-day Eurasians modern humans (about 1–2%). 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. This is likewise
The dogs and the lion's skin The dogs and the lion's skin The dogs and the lion's skin is a fable ascribed to Aesop and is numbered 406 in the Perry Index. However, it is only found in a mediaeval Greek manuscript claiming to be a translation from the Syriac (Syntipas, Fable 19). The story relates how some dogs, finding the skin of a lion, began to tear it to pieces. Seeing them, a passing fox remarked, "If this lion were alive, you would soon find out that his claws were stronger than your teeth." The moral in the original commented that "the fable is for