Expression of the Distalless-B gene in Ciona is regulated by a pan-ectodermal enhancer module

► 400 bp element 200-600 bp upstream of Ci-Dll-B activates transcription ► 100 bp submodule essential and drives posterior animal expression ► 3 other submodules drive anterior expression in combination with posterior module ► The region between Ci-Dll-A and Ci-Dll-B is not an activator for Ci-Dll-B