IV curves of apparent single-OmpF current I₃ (sum of the three monomer currents) in the absence of the antibiotic (black crosses) and with enrofloxacin given at the trans side (A) and the cis side (B) at 0.1 mM (red squares) and 0.3 mM (green circles). LPS: open symbols and dashed lines; DPhPC: filled symbols and solid lines. The insets provide an enlarged presentation of the range where the IV curves differ. Data points are shown as mean and standard error, n = 2–9 per symbol, with a total of 199 current traces.