RSRT is the target site for the RSR recombinase. It is composed of two 14bp inverted repeats flanking a 3bp spacer sequence: 5'-TTGATGAAAGAATAacgTATTCTTTCATCAA-3'. RSR mediates recombination between a pair of RSRT sites. This recombination event results in genetic modification, the nature of which is influenced by the relative orientation (direct or inverted), location and composition of the two recognition sites (FBrf0214794).