Included within a 2.56kb genomic BalI fragment that encompasses the Su(P) transcription unit.
position of restriction fragment on reference sequence inferred by FlyBase curator
In ref(2)P mutants that are also homozygous or hemizygous for Su(P) alleles P{Su(P).2.56} males are fertile. In ref(2)P mutants that are also heterozygous for Su(P) alleles with a wild type chromosome P{Su(P).2.56} males are sterile.