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LPS binding. (a) Binding of polymyxin B (PmxB) and LL-37 to LPS from E. coli O1111:B4, as determined by chromogenic Limulus assays. (b) The same data from panel a but as a Hill plot. The term log10 [(FI)/(1.0 − FI)] on the ordinate is described in the Materials and Methods section. The Hill coefficient (n) shown in the figure corresponds to the slope of the continuous or interrupted regression lines.
