Two point mutations have been introduced, resulting in N521A and F523A amino acid replacements.
Posterior cuticular defects are observed in embryos expressing aretRRM3.Scer\UAS.P\T under the control of Scer\GAL4nos.UTR.T:Hsim\VP16. Up to 14% of cuticles have fewer than the expected eight abdominal denticle belts.