The loxP cassette in TI{TI}Dsec\Ir75bRFP has been excised, removing the Disc\RFPDsRed(T1).3xP3.cHa marker. This leaves a Dsec\Ir75b locus lacking parts of exons 3 and 4 and with a single attP site and a single loxP site inserted in place of the deleted sequence.