The leak about the aDNA "J2b2" sample did concern a Chalcolithic Suvorovo burial in Moldova/Ukraine border region, not Usatovo.Proto-Usatovo Culture from Ukraine has potential E-V13, J2b2 is not from Usatovo context.
Edit: Actually I have to correct myself. The leak was about aforementioned geographic location tied to a specific date, namely 4500-3500 BCE. The Suvorovo connection was mostly one of the possible archeological complexes it could have been affiliated with.
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