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STRUCTURE analysis of the Estonian Native Horse (ENH) with (A) the 8 Northern European pony breeds in Group A at K = 7, K = 8 and K = 9, and (B) with the remaining 14 breeds in Group B and Exmoor Pony at K = 12. Optimal population clustering for Group A and B indicated by asterisks (*). Breed abbreviations are listed in Figure 1.
