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Originally Posted by Milesian
I've seen that before, but I'm not sure what to make of it.
I think I'm right in saying that because the Russian-Baltic group has the largest variation then it is assumed as being the earliest. However, an alternative explanation could be that it has simply mutated faster for some reason?
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These seem to be old rather than recent mutations. When a sub-population branches off from its parent group, the former usually doesn't inherit the whole spectrum of diversity of the latter.