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The reason is they retreated after the collapse, and simply died through the last of times of the state as they were constant manpower for wars. Their population replaced with their Germanic allies afterward. Moreover, it is not possible to see genetic footprints of them in aDNA, it is already absorbed. In terms of ancient samples, we have two legit samples who are Hunnic. (One cluster with Xiongnu and from Serbia, other clusters with Gokturks and from Germany)
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