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(A) Amino acid sequences of AgrD propetides with known structure compared with the AgrD sequence of Listeria monocytogenes. (B) Structure of synthetic cyclic peptides tested for autoinducing activity in L. monocytogenes. Amino acid residues of the native (A) or synthetic (B) peptides involved in thiolactone ring formation are labeled in green, those found in the N-terminal tails in yellow. The central cysteine or serine is marked by a red letter.
