TABLE 1.

Colistin MIC of various mutant strains in the presence of Al³⁺

Colistin (μg/mL)	WT	ΔpmrA	ΔpmrB	ΔpmrC	ΔeptA	ΔnaxD	ΔpmrC ΔeptA	ΔpmrC ΔeptA ΔnaxD
0 µM Al3+	2	2	2	2	2	2	2	2
500 µM Al3+	8	2	2	2	4	8	2	2