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Proto-Bulgarians is Turkic people and most probably they have Y dna R1a, R1b, J2 and some branch of G2, Q1 and N1. We see modern bulgarians have E-V13(neolitic balkanic it came from nort africa) and I2a(Mesolitic European origin) This two linage(E-V13 and I2a) is not common in Turkic people.
https://en.wikipedia.org/wiki/Bulgars
https://en.wikipedia.org/wiki/Bulgarians
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