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Phylogenetic tree of the open reading frame-1 nucleotide sequence of torque teno mini virus (TTMV) isolates TTMV-LY1, -LY2, -LY3 and Betatorquevirus constructed by the neighbour-joining method. TTMV-LY genomes isolated from pleural effusion samples are circled. Scale bar = 0.1 nucleotide substitutions per position.
