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I've read claims that the ancient Romans may have helped spread J2 (Y-DNA) within Europe, with concentrations of a J2 subclade apparently matching old Roman borders. I am unable to find speculation concerning J2 (mtDNA) which appears to be spread through-out Europe in small percentages, which seems rather odd. Does anyone have any theories about this?
Please excuse my ignorance, I'm new to haplogroups
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