A. Relative abundance of the clones according to number of Abcc4 copies detected by FISH in the different cell lines (WT: wild-type cells; CR100, 150, and 200: cells resistant to 100, 150, and 200 µM of ciprofloxacin; Rev200: revertant cells). Hsr, homogeneous staining region. B. Schematic representation of chromosomes with Abcc4 copies in the same cell lines (only chromosomes with Abcc4 copies are shown; Chr der(14)T(3;14)(E2;C?1) (Chr B), present in almost all clones, but which lacks Abcc4 locus, is not represented). Percentages refer to the relative abundance of each clone, and letters between brackets to Chromosomes as identified in Figure 2.