In this Article, three of the images in Fig. 2b are incorrect. In the growth complementation tests of ΔacrB strains, all 14 lower panels, from (−) for +Norflaxin to M206A for +Norfloxacin, should have been cropped from the original plate images. However, during the preparation of Fig. 2b we inadvertently cropped the lower panels for Y139A, N157A and N180A from the wrong plates (P26A, M206A and M173A, respectively). Figure 1 shows the incorrect, as-published original Fig. 2b and the corrected Fig. 2b, with the three affected lower panels (Y139A, N157A and N180A for +Norflaxin) now corrected. Since all the growth scores for both the corrected and the incorrect, as-published panels are negative (that is, marked ‘−’ for not complemented), these errors do not change our conclusion for the evaluation of the mutation effects. The original Article has not been corrected online.

Fig. 1 This figure shows the incorrect, as-published original Fig. 2b and the corrected Fig. 2b. Full size image