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Neighbor-joining clustering of the regions of proviral locus 1 based on relative dinucleotide frequencies. All proviral genome segments (1p-8p) group together, as do the regions outside the flanking repeats (I and IV). The scale represents the normalized Euclidean distance between regions. Regions < 500 bp (isg1–3, 5) and the flanking repeats (L1R1 and L1R2) were excluded from the analysis, as they have skewed dinucleotide frequencies.
