- Characterization of gyrA, gyrB, grlA and grlB mutations in fluoroquinolone-resistant clinical isolates of Staphylococcus aureus. Takahashi, H., Kikuchi, T., Shoji, S., Fujimura, S., Lutfor, A.B., Tokue, Y., Nukiwa, T., Watanabe, A. J. Antimicrob. Chemother. (1998)