Most of the endogenous peg locus (including the entire coding sequence) has been deleted. The following sequence (derived from a pTV[Cherry]-based donor) has been inserted in place of the deleted peg sequence: a single attP site and a loxP cassette which itself contains an mFRT71 cassette followed by Scer\GAL4 coding sequence and a polyadenylation signal (this GAL4 sequence is non-functional). The mFRT71 cassette contains 1: the mCherry coding region tagged with a membrane-targeting signal (Tag:Myr(Unk)) and followed by a polyadenylation signal, 2: a w+* marker.