https://youtu.be/nt9pxuMJsGk
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It seems that, besides Zabolotnie Tatars, mostly Siberian Bukharans were taken into account. This is evident because of frequency of Y-DNA J and G haplogroups. If other Siberian Tatars were also taken into account I think that the frequency of Q and R1a haplogroups, as well as of a Sibirid phenotype would be much higher.