Figure 1 in Development and evolution of regionalization within the avian axial column

Figure 1. Simplified vertebrate phylogeny with selected published Hox expression boundaries within the somitic mesoderm. Axial skeletons are drawn in dorsal view, except for zebrafish drawn in left lateral view. Anterior–posterior Hox expression boundaries are represented by coloured bars. Fusions within the axial column are represented by black shading. Zebrafish expression patterns are reported by Morin-Kensicki et al. (2002), whiptail lizard by Woltering et al. (2009), alligator by Mansfield & Abzhanov (2010) and chicken and mouse by Burke et al. (1995).