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Genetic admixtures between ‘allotetraploid’ red birch and white birch in Groups (Gr) 1, 2 and 3. Admixture values are based on STRUCTURE results for dataset D1 at K = 3. Black and grey represent genetic admixture from ‘allotetraploid’ red birch into white birch and from white birch into ‘allotetraploid’ red birch, respectively.
