FIG 1.

Global distribution of Chlamydia trachomatis strains harboring the tryptophan operon used in this study. Colors indicate the geographic areas or continents that were the sources of the samples as shown in the key. Circles within countries show the number of samples from that country. Countries neither sampled nor included in this study are shown in white. The scale bar underneath the map provides a visual indication of the size of features, and distance between features, on the map. Map was generated by SimpleMappr.