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Dendrogram showing clustering of XDR-TB genotypes. Strain numbers A88, B42, C10, C28, C29, C52, C98, D22, E19, and E42 represent XDR-TB strains with the typical pattern of the Beijing family genotype. Strain numbers C57, C80, and D17 represent the genotype of the T1 family. M. tuberculosis H37Rv and Mycobacterium bovis BCG were used as controls.
