In "A. fischeri", there are two primary quorum sensing systems, each of which respond to slightly different environments. The first system is commonly referred to as the "lux" system, as it is encoded within the "lux" operon, and uses the autoinducer 3OC6-HSL. The protein LuxI synthesizes this signal, which is subsequently released from the cell. This signal, 3OC6-HSL, then binds to the protein LuxR, which regulates the expression of many different genes, but is most known for upregulation of genes involved in luminescence. The second system, commonly referred to as the "ain" system, uses the autoinducer C8-HSL, which is produced by the protein AinS. Similar to the "lux" system, the autoinducer C8-HSL increases activation of LuxR. In addition, C8-HSL binds to another transcriptional regulator, LitR, giving the "ain" and "lux" systems of quorum sensing slightly different genetic targets within the cell.