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Alignment of B. fragilis GyrA (A) and GyrB (B) protein sequence with their counterparts in E. coli and S. aureus. An asterisk indicates identity among all three proteins. The numbers indicate amino acid residues. Residue Ser-82 (S) in B. fragilis GyrA and the position of the catalytic tyrosine (Y) residue involved in DNA breakage reunion (12) are in boldface and underlined.
