TI{ywing2+} represents a DNA segment that has been inserted into the genome by homology directed repair using CRISPR/Cas9 in combination with a donor plasmid. The inserted TI{ywing2+} DNA is not flanked by transposable element ends and consists of the ywing2+ dominant marker flanked by the nucleotides 'GG' and 'CC' upstream and downstream, respectively. These flanking dinucleotides generate two novel Cas9 target sites that are not present in the endogenous sequence, allowing for removal of the TI{ywing2+} DNA segment via a second round of homology directed repair.