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Coefficients of membership in various gene pools inferred with the STRUCTURE program, based on data sets including 40 Malus domestica reference samples (green, N = 40) and one of the three wild Malus species in each case. The x‐axis is not shown in scale. Hybrids were detected by running STRUCTURE from K = 2 to K = 3 for Malus sieversii and up to K = 4 for Malus sylvestris and Malus orientalis.
