Increases in MICs for target-altered mutant strains. Abbreviations: Nad, nadifloxacin; Spa, sparfloxacin; Cli, clinafloxacin; Gat, gatifloxacin; Mox, moxifloxacin; Paz, pazufloxacin; Gre, grepafloxacin; Lev, levofloxacin; Ofl, ofloxacin; Tro, trovafloxacin; Lom, lomefloxacin; Cip, ciprofloxacin; Fle, fleroxacin; Eno, enoxacin; Nor, norfloxacin.