Most haplogroups can be further subdivided multiple times into sub-clades. Archived from the original on 3 May Some may have Native American heritage as well. Archived from the original on 8 August For a non-technical introduction to genetics in general, see Introduction to genetics. Greenspan enlisted the help of a male Nitz cousin. Testing companies such as Ancestry. Typical tests test between 12 and STR markers. Since different testing companies use different ethnic reference groups and different matching algorithms, ethnicity estimates for an individual will vary between tests, sometimes dramatically.
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