Population structure and admixture proportion. (A) NGSadmix plot (K = 5) showing the hybrid genetic background of the European populations. (B) Admixture plot (EIGMIX) where the Russian, Scottish and Latvian populations where selected as proxies of the ancestral postglacial gene-pools in Europe and thus, are located at the vertices of the plot. The remaining samples were positioned according to their level of admixture along the sides of the triangle.