Fully suppresses the phl1 phenotype in terms of viability and the morphologies of the eye and wing veins. The extra wing vein and eye phenotypes of rlSu23/+ flies are significantly enhanced by Df(2R)rl10b or rl1. The posterior defects of embryos derived from homozygous fs(1)M31901 females is not suppressed if the females are also carrying one copy of rlSu23. Enhances the tor11D phenotype; considerable numbers of embryos laid by females heterozygous for rlSu23 and tor11D fail to hatch at 28oC. Dominantly suppresses the proliferation defects seen in homozygous phl1, Dsor1Gp158 or Dsor1r1 clones in imaginal discs.