The loxP cassette present in TI{TI}fruΔP1.DsRed+ has been excised, removing the Disc\RFPDsRed(T1).3xP3.cHa marker.
Precise deletion of the fru P1 first exon.
A 1.4kb region of the endogenous fru locus, extending from approximately 1kb upstream of the transcription start site of the P1 promoter to just before the end of the first exon, has been deleted.