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Diversity of the major outer membrane protein (MOMP) gene ompA. (A) Phylogenetic relationship between all 563 Chlamydia trachomatis isolates (ompA gene) shows separation into three clades labeled α, β, and γ. (B) Phylogenetic tree of 1003 MOMP-encoding genes across the Chlamydiaceae. (C) Divergence (proportion of differing nucleotides) of the ompA gene in three C. trachomatis clades compared with that of a reconstructed ancestor, shading indicates 10th and 90th percentiles.
