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James Greer's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with James or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Family Tree DNA Y-DNA Test 111 markers, haplogroup R-M269, Ysearch 4QXW3, FTDNA kit #493368
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test HVR1 and HVR2, haplogroup H, FTDNA kit #493368
It is likely that these autosomal DNA test-takers will share DNA with James:
Family Tree DNA Family Finder, GEDmatch T826838, FTDNA kit #493368