10% of heterozygotes have ectopic or duplicated macrochaetae.
Delta266 has macrochaeta phenotype, enhanceable by brm[+]/brm2
Delta266 has ommatidium phenotype, enhanceable by brm[+]/brm2
Delta266/Dl[+] is an enhancer of macrochaeta phenotype of brm2
Delta266, brm2 has humeral bristle phenotype
Delta266/Dl[+], brm2 has humeral bristle phenotype
Selected as: a mutation that is a dominant modifier of the eye defects caused by expression of brmK804R.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4ey.PH.