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Trees of nucleotide sequences of parC and gyrA QRDRs. The 185-nucleotide parC sequence included positions 213 to 397, and the 280-nucleotide gyrA sequence included positions 175 to 454. Nucleotides are numbered by taking the first gyrA and parC nucleotides as nucleotide 1. The trees were compiled by using the CLUSTAL multiple-alignment program from PCGENE with default parameters. The nucleotide sequences used have been previously reported (20, 22, 36).
