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Kittles claims to have a database of more than 25, 000 lineages from more than 384 African ethnic groups.
CNN: DNA provides clues to family's African heritage
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Kittles believes that it's because what is now Sierra Leone was a common route for the slave trade.
CNN: DNA provides clues to family's African heritage
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Kerry Kittles owns the franchise season-record with 158, set during the 1996-76 season.
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Though it's extensive, Kittles says, African Ancestry's database is not complete and reflects only about 45 percent of the continent of Africa.
CNN: DNA provides clues to family's African heritage
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Johnson's results were fairly typical, according to Kittles, who estimates that one-third of his clients can trace their roots to the same region.
CNN: DNA provides clues to family's African heritage
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Johnson's DNA sequence was a 99.7 percent match to the Mende people, and Kittles says his database is so large that most clients have a direct match.
CNN: DNA provides clues to family's African heritage
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Kittles estimates that his company has sold 13, 000 DNA kits.
CNN: DNA provides clues to family's African heritage
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"Once we get the sequence -- what we called the DNA profiles from the African-American that is being tested -- we compare that profile to profiles in the database, " Kittles explained.
CNN: DNA provides clues to family's African heritage