Fig. 1. Developmental expression of her7 and comparison with other segmentation and cyclic genes. Embryos at epiboly stages are shown in whole mount from a dorsovegetal view (A,B). A lateral view of the tail tip of a 25-somite embryo is shown in F. Comparison by two-color in situ hybridization of segmental and cyclic genes in the presomitic mesoderm in embryos at 14 hpf (10 somites) is shown in dorsal view after flat mounting with anterior upwards (C-E,G-J). In all panels, her7 has been developed in blue/black. (C-E) Domains of cyclic gene expression at stages III, I⁺ and II, according to the nomenclature of Jiang et al. (Jiang et al., 2000); these stages are repeated in G-J. The co-expression of myod (G), her1 (H), dlc (I) and dld (J) are shown in red. (K) Diagram of the relative positions of the domains of cyclic gene expression (her7, black; her1, green; dlc, red; dld, blue) to each other within a combined domain moving anteriorly (arrow) in the PSM. (L) The gene expression cycle experienced multiple times by individual cells in the PSM, inferred from the spatial relationships (K).