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You may have Jewish ancestry, but it's unlikely to have anything to do with R2a. Jews with R2a either picked it up in the Babylonian diaspora or during the Persian control of Israel. I'll be surprised to see R2a in Israel prior to the Babylonian Exile. It's native to the Eastern Middle East. Could you fall into a Jewish subclade of R2a? Possible, but I doubt it. Your cousin matching is the much stronger reason to suspect any Jewish ancestry. Do you have any other Jewish matches?
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