mtDNA of white Americans

Am. J. Hum. Genet., 72:804-811, 2003

"All nine major European haplogroups [note: H I J K T U V W X] were observed in our sample and did not differ significantly from a previous study of a similar North American control population (Torroni et al. 1994) (table 2). In addition, a nearly identical percentage of individuals (8.2% in control subjects and 8.5% in patients with PD) did not fit into these nine predefined haplogroups and were classified as "others." This group most likely consists of rare European haplogroups (e.g., R or Z) or the historical admixture known to exist in the North American white population (Finnila et al. 2000; Richards et al. 2000)."

[Note that R and Z mentioned in the article as examples of rare European haplogroups occur at a combined frequency of <1% in white Europeans (Am. J. Hum. Genet., 67:1251-1276, 2000).]