The tentative map location of the suppressor gene or of the nearby Tn10dTc element was determined using the Mud-P22 lysogen collection of BENSON and GOLDMAN 1992.
These encode resistance to the antibiotic, allowing selection of lysogens in a wide variety of strains, including those resistant to the antibiotics tetracycline, ampicillin, kanamycin, and chloramphenicol.