A 2014 genetic analysis published in the journal Nature reported that the DNA from a 24,000-year-old skeleton excavated in Eastern Siberia provided mitochondrial, Y chromosomal, and autosomal genetic evidence that suggests 14 to 38% of Native American ancestry originates from an ancient Western Eurasian population. The Mal'ta boy skeleton's mitochondrial genome belonged to mtDNA haplogroup U, which has also been found at high frequencies among Mesolithic European hunter-gatherers. The authors state that their findings have four implications, the third being that "such an easterly presence in Asia of a population related to contemporary western Eurasians provides a possibility that non-east Asian cranial characteristics of the First Americans derived from the Old World via migration through Beringia, rather than by a trans-Atlantic voyage from Iberia as proposed by the Solutrean hypothesis".