Another study on maternal haplogroups in Sri Lankan groups (also the Vedda, Sri Lankan Tamil, and Sinhalese) found similar results, with the Vedda belonging predominantly to the mitochondrial haplogroup N (which "exists in almost all European, Oceanian, and many Asian and Amerindian populations.") and its subgroups U and R (with those comprising about two thirds of their maternal lineages), differing from other South Asian groups (such as the Sri Lankan Tamil, Sinhalese, and several Indian Tribal groups) among whom haplogroup M is predominant. The study also found that "South Asian (Indian) haplogroups were predominant" in the three Sri Lankan groups (including the Vedda) but that the Sinhalese, Sri Lankan Tamil, and Vedda populations also "had a considerable presence of West Eurasian haplogroups." One phylogenetic study on mitochondrial DNA hypervariable segments HVI and part of HVII showed the Vedda to be "genetically distinct from other major ethnic groups (Sinhalese, Sri Lankan Tamils and Indian Tamils) in Sri Lanka." Another study on alpha-2-HS-glycoprotein allele frequency showed the Veddas and Sinhalese to be more biologically related to each other than to most other ethnic groups in Asia.