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Examples of quorum-sensing signals produced by Gram-positive bacteria. (A) Unmodified linear peptide signals produced by Bacillus and Streptococcus. (B) Enterococcus plasmid pheromones and their corresponding inhibitors. (C) The cyclic autoinducing peptides produced by many Gram positives. (D) The ComX competence pheromone of B. subtilis 168. The tryptophan residue is farnesylated through an unusual posttranslational modification.
