Fig. 7. Enhancer activity of individual Hoxb5 non-coding elements in transgenic mouse embryos. (A-H) Reporter transgene expression was analyzed in primary transgenic embryos whose age varied from E12.5 to E14.5. The name and origin of the tested CNE are shown at the bottom right-hand corner of each panel. Arrowheads mark somite derivatives; arrows point to the neural tube. Mm, Mus musculus; Dr, Danio rerio; a and b refer to the hoxba and hoxbb zebrafish complexes, respectively. Scale bar: 1000 µm.