The loxP cassette has been excised from TI{TI}chers24w+, resulting in a chromosome in which the endogenous cher locus contains a deletion of the entire C-terminus including the promoter region of the short isoforms (deletion coordinates 3R:17099072..17091407 , release 6 genome). Sequence encoding a single attP site and a single loxP site are present in place of the deletion.