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Deferred antagonism assay. S. mutans UA159 (wild-type, WT), ΔclpP and ΔclpX were spotted onto agar plates and allowed to grow for 24 h before an overlay with the test strain was introduced. (a) Overlay with S. gordonii DL-1 (mutacin IV sensitive). (b) Overlay with L. lactis ATCC 11454 (mutacin V sensitive). The images shown are representatives of three independent experiments.
