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African American DNA Research Forum

Meaning of small letter added to haplogroup

What is the meaning of the small letter they may add to the haplogroup. I was tested as L3 with four mutations. I uploaded these results from the National Geographic testing to Family Tree DNA. I joined the L3 project on Family Tree DNA and now see that I am listed as L3d. What does it mean?

18 Dec 2002 :: 14 Nov 2008
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