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Phylogenetic tree based on XMRV sequences in the left half of mERV-XL. A BLAST search of the GenBank databases using bases 297 to 3932 of mERV-XL was conducted, and a maximum-likelihood phylogenetic tree was constructed from the resulting sequences using MEGA5 software (9). Bootstrap values are shown for 1,000 replicates, and the scale bar indicates evolutionary distance in base substitutions per site. chrom 9, chromosome 9.
