... elB is normally expressed, it has an essential role. In elB null mutants, fewer cells join the dorsal branch, and these branches migrate abnormally. In addition, the cells normally forming the lateral trunk anterior remain in the transverse connective, and the ganglionic branches are stalled. We...

..., the cells of the dorsal trunk, visceral branch and lateral anterior branch migrate anteriorly away from the stripe of Hh-expressing cells. The cells forming the dorsal branch migrate dorsally under the Hh stripe ( Fig. 1D ). Fig. 1. Hh expression in the ectoderm abuts the tracheal placodes. (A,B...