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Fig. 4. The Ubx{Delta}YPWM protein is a defective transcriptional repressor of Dll and Antp. (A-F) In situ hybridization of mid-stage 11 embryos, hybridized with Dll (green) and Antp (red) antisense probes. The broken white lines in A,C,E indicate the posterior boundary of wg expression, which was detected in the same embryos (not shown). Dll and Antp P1 transcripts shown in the thoracic segments of (A,B) a wild type embryo, (C,D) an embryo ectopically expressing wild type Ubx and (E,F) an embryo ectopically expressing Ubx{Delta}YPWM protein. (G) A dose-response plot of Dll repression as a function of the logarithm of the protein concentration of wild-type Ubx and Ubx{Delta}YPWM.