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Anthropologists claim that in the Mycenean era that homogenous blend that has lasted to today was already formed. So this may suggest the Proto-Greeks did not arrive predominantly as R1, but they also may have carried other clades before they mixed with pre-Greek Minoan and Helladic civilizations. If that is the case than the genetic impact of those proto-Greeks had been quite significant.
We also have to consider that the pre-Greek civilizations most probably were not uniform culturally. All this indicates that the proto-Greeks may well have been a plurality when the mixing occurred prior to the Mycenean era. Their language dominated, though heavily influenced by pre-Greek people.
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