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Spot assay showing the resistance and susceptibility of the transposon knock-out mutants to KIL3b and KIL5. On the left, CFBP 1770 ΔOX88_RS20865 sensitive to KIL3b and resistant to KIL5, and on the right, CFBP 1770 Δdhrr resistant to both phages. A dilution series (106 – 105 – 104 PFU/mL) of phage was spotted on a bacterial lawn containing CFBP 1770 ΔOX88_RS20865 and CFBP 1770 Δdhrr.
