2
Most South Slavs seem to be part of the Slavic clusters of R1a. Although Illyrians and Thracians did have R1a and R1b clusters as they were Indo-Europeans and other haplogroups like E-V13 and J2b2/J2a were absorbed by the original Indo-European Illyrians and Thracians so in short Illyrians and Thracians were originally R1a and R1b just like other Indo-European populations
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