An aberrant homologous recombination event at the gNacα locus has resulted in the insertion of donor plasmid sequence in which gNacα upstream and downstream homology were inserted into the pHD-DsRed-attP plasmid (which contains a Disc\RFPDsRed(T1).3xP3.cHa marker flanked by loxP sites, plus a single attP site). Two full repeats and a partial repeat of the donor plasmid have been inserted in place of the gNacα gene, such that the inserted sequence includes 3 copies of the Disc\RFPDsRed(T1).3xP3.cHa marker.