Figure 5.

Maximum clade credibility tree of the Old World Collection. Estimated divergence dates are shown in years based on median heights and a substitution rate of 5 × 10⁻⁸ substitutions/site/year (Kay et al., 2015). Negative numbers refer to BCE and positive numbers refer to CE. Branches are coloured according to the inferred most probable geographic origin. Nodes corresponding to the most recent common ancestors (MRCA) of each lineage, lineage splits, and the MRCA of Mycobacterium tuberculosis (outlined black) are marked with circles and coloured to reflect their most probable geographic origin