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Phage susceptibility of L. lactis IPLA517, IPLA641, IPLA729, and IPLA1064 (gray bars) and their Lcn972R mutants (white bars). Phage titer was determined by the double layer assay. (A) Phage CHPC1130 (1.5 × 1010 PFU/ml). (B) Phage CHPC1180 (4.6 × 109 PFU/ml). (C) titers of phage CHPC1130 on novobiocin plasmid-cured derivatives (N1–N10) of L. lactis IPLA517.
