Point mutations have been introduced into the RRM2 and RRM3 domains, resulting in four amino acid replacements: K239A and F241A (RRM2) and N521A and F523A (RRM3).
No posterior cuticular defects are observed in embryos expressing aretRRM2.Scer\UAS.P\T under the control of Scer\GAL4nos.UTR.T:Hsim\VP16. 100% of cuticles have the expected eight abdominal denticle belts.