A knock-in allele, in which Tag:HA is inserted in the active domain of the dpp protein at the same position as in dppUAS.T.EGFP, and the three N-glycosylation sites in the second exon are mutated to Q. The mutagenesis method took advantage of two transposable elements (Mi{MIC}dppMI03752 and PBac{RB}e00178) flanking the second (last) coding exon of dpp, and the resulting knock-in allele acquires the mini-w+ from PBac{RB}e00178.