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Clustering of sequenced strains based on reference-free SNP calling. Hierarchical clustering of sequenced strains based on distance matrix. Distance matrix obtained from SNP data set generated by DiscoSNP++ software. Distance is scaled to “(0, 1)”. On dendrograms, dark green denotes Switzerland strains, light green denotes Alaskan strains, light blue denotes strains previously genotyped as lineage A, and the moccasin color depicts strains previously genotyped as lineage B (11).
