The most prevalent haplogroups in Bulgarians are I-M423 (20.2%) and E-V13 (18.1%). They represent the autochthonous and nearly endemic sub-clades of I-P37 and E-M78 in Southeastern Europe, respectively [34], [43]. Third in frequency is the common Eurasian haplogroup R-M17, which was found in 17.5% of Bulgarians, with 42.9% of them belonging to the
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