It must be connected with gigantic dinaric dudes who are so fucking clanish and nationalistic. I call it proto Ustaša-Četnik-Balija marker and it's totally unique among Slavs, nobody else has big amount of it.
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https://mytrueancestry.com/img/SampleMapArch.jpg
Your closest Archaeogenetic matches...
1. Central Roman (590 AD) (10.85)
2. [Hidden] - upgrade your account (11.46)
3. Central Roman (590 AD) (12.12)
4. [Hidden] - upgrade your account (12.67)
5. Central Roman / Mixed (590 AD) (14.52)
6. [Hidden] - upgrade your account (15.42)
7. Central Roman (590 AD) (15.59)
8. [Hidden] - upgrade your account (16.6)
9. Mycenaean (1350 BC) (16.61)
And it's very low in Greece/Bulgaria/Macedonia which is interesting. It really is just a Serb/Croat/Bosniak clade in the vast majority of cases. Saying that, I have a Belarussian match, but he claims his paternal ancestor was a Kosovan Serb horsemen.