Schematic phylogenetic tree of all mitochondrial haplogroups found in the Laos sample (N = 214). Haplogroups according to , release 8. The circles' sizes correspond to the haplogroup frequencies. The diameter bar indicates the number of samples. Prehaplogroups are denoted as haplogroups, stem lengths are of no information content. The tree is rooted in the most recent common ancestor. Gray circles: descendants of haplogroup M; black circles: descendants of haplogroup N; empty circles: descendants of haplogroup R.