Unifying phylogeny for Mycobacterium tuberculosis. A) Maximum parsimony tree of M. tuberculosis and M. bovis based on 37 silent single-nucleotide polymorphisms in 225 isolates. Synonymous sequence types (SST) are marked 1–35. The frequency of each SST is marked in parentheses. The nodes of the major lineages are highlighted: lineage I (cyan), lineage II (red), lineage III (blue), lineage IV (yellow), and M. bovis (green). The colors correspond to those in Figure 2. Note both M. africanum Type I