Imprecise excision of the progenitor P{GT1}Brms1BG01329 insertion, resulting in a 1239bp deletion that removes the start codon and all three coding exons of Brms1.
Inferred boundaries of a 1239 bp deletion resulting from the imprecise excsion of P{GT1}Brms1BG01329, removes all the coding exons of Brms1.
Homozygous clones in the wing result in wing notching.