Function of dTrbd in the Wingless response of Drosophila. Eyes from control y w flies (A), or from flies after expression, in the larval eye disc of Wingless (B–D), Armadillo (E,F), Argos inhibitor of EGF receptor (G,H), or Delta agonist of Notch receptor (I,J). (A,B,E,G,I) +/+. (C,F,H,J) trbd/+. (D) dTCF3/+. trbd heterozygosity suppresses the rough eye phenotype due to ectopic Wingless or Armadillo (C,F), but not that due to ectopic Argos (H), Rhomboid (not shown), or Delta (J).