Figure 2From: Bench-to-bedside review: Quorum sensing and the role of cell-to-cell communication during invasive bacterial infectionTwo types of autoinducer type 2 quorum sensing systems in different genera of Gram-negative bacteria. The two autoinducer type 2 (AI-2) quorum sensing signal systems found in Salmonella spp. and in Vibrio spp. ABC, ATP-binding cassette transporter; Lrs, LuxS regulated; P, promoter site; P*, phosphorylated; Vir, virulence.Back to article page