Expression of Dll1 target and cranial and caudal somite marker genes at E10.5 in Tg(msd/Dll1)Ieg transgenic and wild-type embryos. Top panels in A to C and panels D, E, I, and J show right lateral views of in situ hybridised whole embryos. Lower panels in A to C and panels F, G, and H show dorsal views of the posterior tail regions. The red brackets in the lower panels of (B) indicate the region of the unsegmented, presomitic mesoderm. The gene transcripts to which the in situ probes were specific are indicated next to each panel. We did not detected reproducible changes in gene expression patterns between wild-type and transgenic embryos for the indicated genes at E10.5. TG, transgenic: WT, wild-type.