The RS(I-SceI) entry in FlyBase represents the recognition site for the I-SceI DNA endonuclease. The recognition site is 18bp in length 5'-TAGGGATAACAGGGTAAT-3'). Cleavage of the RS(I-SceI) site by I-SceI DNA endonuclease results in a double-strand DNA break (PMID:2183191).