CPS affects the binding of polymyxin B to the cell surface. Binding of polymyxin B to purified OMs (A), purified LPSs (B), and bacteria (C) is shown. Each point represents the mean and standard deviation (covered by the symbol) of four samples, and significant differences between 52145 and 52K10 are indicated by asterisks. Symbols: •, K. pneumoniae 52145; ○, K. pneumoniae 52K10.