Figure. . Schematic representation of the Chlamydia trachomatis ompA gene. In detail, variable segment 2 (VS-2): nucleotide and amino acid (aa) sequence comparison of the prototypes L1, L2, L2´, L2a, and L3 and the newly identified lymphogranuloma venereum (LVG) strain, which we designated L2b. Conserved nucleotides in VS-2 for all LGV strains are shown in red. The nucleotide substitutions in L2b as compared to all LGV strains is indicated by arrows. All aa encoded by the substitution combinations are indicated. CS = constant segment; omp = outer membrane protein.