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R1b in Greece is mostly Dorian/Proto-Greek or it can be from Illyrians and Proto-Thracians. But J2 can be also ancient Greek. The ancestors of Myceneaens were a mix of steppe population with Pre-Indoeuropean populations they met leaving the steppes with haplogroup J2. So many of Myceneans were J2. R1a is ambiguous since a big part of it is Slavic. On the other hand some R1a is possibly from Proto-Greeks. I asked the author of haplogroup articles in eupedia and he told me that R1a-M458 maybe a clade some Proto-Greeks had.
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