Amino acid alignment of partial ThyX proteins of the following organisms (with accession numbers): Borrelia burgdorferi (NP_045749), B. garinii (CP000015), B. hermsii (AAT68707), Chlorella virus (NP_049030), cyanophage P60 (NP_570363), Dictyostelium discoideum (XP_641335), Ehrlichia canis (ZP_00211002), Helicobacter pylori (NP_224139), Magnetococcus sp. (ZP_00605242), mycobacteriophage Bxz1 (NP_818164), Prochlorococcus marinus (NP_874667), Rickettsia prowazekii (NP_220685), Streptomyces avermitilis (NP_823693), Thermotoga maritima (NP_228259), Thermus thermophilus (YP_004706), Treponema denticola (NP_970925), T. pallidum (AAC65955), Tropheryma whipplei (NP_787744), and a Wolbachia endosymbiont of Drosophila melanogaster (NP_966910). Numbers indicate the positions of the amino acids aligned according to the B. burgdorferi sequence. The consensus amino acids are shown at the bottom. The cysteine-for-arginine substitution in B. burgdorferi and B. garinii at position 91 is highlighted in gray.