4-Hydroxy-2-alkylquinolines (HAQs) are a class of intracellular signaling molecule associated with iron chelation. HAQs are produced by various types of bacteria, such as Pseudomonas aeruginosa, and are involved in quorum sensing.

4-Hydroxy-2-alkylquinolines (HAQs) are a class of intracellular signaling molecule associated with iron chelation. HAQs are produced by various types of bacteria, such as Pseudomonas aeruginosa, and are involved in quorum sensing.