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LPS patterns of P. aeruginosa strains. Partially purified LPS of P. aeruginosa PAO1 (wild type) (lane 1), AK1012 (core mutant) (lane 2), AK1401 (B-antigen mutant) (lane 3), PAN1 (lane 4), and suppressor strains PAN15 (lane 5) and PAN16 (lane 6) were separated by SDS-PAGE and visualized by silver staining. LPS molecules containing multiple repeating units of the O antigens were not detected due to the small amounts of LPS loaded.
