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Nucleotide (A) and amino acid (B) sequence variations in the gyrA genes of S. pneumoniae strains. See the legend to Fig. 3 for details. Codons are numbered according to the R6 sequence. The strains used were R6 (GenBank accession no. AF053121), 7785 (accession no. AJ005815), AB (accession no. AB010387), 3180 (accession no. AF170993), 3870 (accession no. AF170994), and 1244 (accession no. AF170993).
