FIG. 2.

(A) Phylogenetic tree based on a 1,149-bp alignment of penA gene sequences of N. meningitidis (n = 321). (B) Phylogenetic tree based on a 402-bp alignment of penA gene sequences of N. meningitidis (n = 321). In both trees, one homogeneous group, comprising wild-type penA genes, was identified. The remaining sequences in both trees were highly divergent and displayed obvious mosaic patterns. One single sequence (*, accession no. AY127670) was identified as a mosaic allele when the larger segment was examined but as the wild type when only 402 bp was examined.