Dendrogram deduced from the clustering analysis of the 92 strains (including CDC1551 and AF2122/97) . The first column from the left identify the strains. The second column indicates the species (Red : M. bovis strains; green : M. africanum strains; yellow : M. tuberculosis strains known to be of the Beijing type and indicated "beijing tuberculosis"; blue : other M. tuberculosis strains). The third column indicates the geographic origin of the strain. The fourth column indicates the ETR pattern (ETR-A to ETR-E) extracted from the full data presented in Table 3. The last four columns indicate, from left to right, the result of the niacine production, nitrate reductase, TCH susceptibility and Lebek tests (0, negative ; 1, positive) when available.