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Schematic representation of the LuxR/AHL type quorum sensing system in Gram-negative bacteria. The “r” is a gene encoding Lux R-type transcription factor R and “i” is gene encoding Lux I-type AHL synthase I. Transcription of QS-regulated target genes appears by Lux R homologue proteins only when high AHL concentration is present, which required a threshold bacterial cell density.
