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Possible transmission routes of the tet(X) genes. The colored circles surrounding the hosts represented the tet(X) carrying bacterial families. The dotted lines represented the possible transmission routes of the tet(X) genes between different hosts. (a) The transmission routes of the tet(X) gene between different hosts. (b) The transmission routes of the tet(X4) gene and their flanking genomic environment (rdmC-tet(X4)-△ISCR2) between different hosts.
