Fig. 4. Expression of Tc'gt. Wild-type (A,B) and in Tc'hb^pRNAi embryos (C,D), at early (A,C) and late (B,D) germband stages. The embryos are double stained with a Tc'gsb probe (brown), which serves as a segmental reference marker. (A,B) Tc'gt (purple) is expressed in an anterior domain and two posterior stripes in wild-type embryos. (C,D) In Tc'hb^pRNAi embryos, the anterior domain is not significantly affected, but the posterior expression of Tc'gt in T3 and A2 (arrows in B) is absent in Tc'hb^pRNAi embryos. The segments where Tc'gt should have been expressed are partially fused in Tc'hb^pRNAi embryos, indicated by the partial fusion of the Tc'gsb stripes (arrowheads in D).