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AI-2 activity of S. epidermidis 1457, its isogenic ΔluxS mutant strain and/or the mutant strain with empty vector complemented with luxS. Cell-free medium was prepared from those strains during the log phase. All experiments were performed in triplicate. WT, S. epidermidis 1457 wild-type strain; M, S. epidermidis 1457 isogenic ΔluxS mutant strain; M(pBT1), S. epidermidis ΔluxS mutant strain containing vector pBT1; M(pBT1-luxS), luxS-complemented S. epidermidis mutant strain.
