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Basically every people living in the modern steppes can claim Scythian descent.
Given for each contemporary sample are pie-charts representing the model posteriors for descent from western
Scythians (black), descent from eastern Scythians (grey) ancestral relatedness to western Scythians (red) or eastern Scythian groups
(green). Also given are the approximate locations of the ancient DNA samples and the historical range of Iron Age Scythian tribes
(orange area). See Supplementary Table 19 for detailed information on contemporary populations.
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That means that their West Eurasian admixture was most likely derived directly from Yamnaya or a very closely related population, look how their non-East Eurasian component corresponds very well to the one from Samara_IA. This is why the best proxy for a Scythian in modern days would be a Lithuanian, which is the modern population with the highest affinity to Yamnaya-Samara, with some variable Siberian or Amerindian admixture, which introduce the East Eurasian admixture and augments the ANE affinity.
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https://www.nature.com/articles/ncomms14615
Genomic inference reveals that Scythians in the east and the west of the steppe zone can best be described as a mixture of Yamnaya-related ancestry and an East Asian component. Demographic modelling suggests independent origins for eastern and western groups with ongoing gene-flow between them, plausibly explaining the striking uniformity of their material culture. We also find evidence that significant gene-flow from east to west Eurasia must have occurred early during the Iron Age.
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f-statistics
We used f4-statistics of the form f4(Test, LBK; EHG, Mbuti) and f4(Test, LBK; Han, Mbuti), which are zero for those Test samples that form a clade with LBK and positive for populations that have EHG- or Han-related ancestry, respectively. We plotted the results against each other, which resulted in a V-shaped pattern with Yamnaya at the apex (Fig. 6). The Iron Age Scythians are arrayed along a cline from Yamnaya to Ami (a population of East Asian ancestry that experienced no admixture), consistent with having ancestry from populations genetically similar to these two groups
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As you can you they seem extremely high on those Scythian populations
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https://www.nature.com/articles/ncomms14615/figures/6
Current R1b samples found in -Yamnaya-3300–2600 BC, Afanasievo-3300 BCE — 2500 BCE, Vucedol-3000 BC – 2200 BC, Catacomb-2800–2200 BC, Bell Beaker-2800–1800 BCE, Poltavka-2700—2100 BC, Scythian-9th century BC up until the 4th century AD, Sarmatian-4th, 3rd and 2nd centuries BCE....
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Ashkenazi Jews
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