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Receptor identification of SP15 using spontaneous mutant bacteria with truncated FhuA. An adsorption assay was performed on the wild-type strain (O157 WT), the spontaneous mutant SP15-resistant O157 harboring truncated FhuATrp511Ter (O157 R01), and the SP15-resistant O157 complemented with FhuA in trans (O157 R01::FhuA). Statistical significance (P < 0.01) was indicated by an asterisk.
