Figure 5C. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.mod.2004.02.002] Mech Dev 121: 387-95, Ozeki H; Kurihara Y; Tonami K; Watatani S; Kurihara H, Endothelin-1 regulates the dorsoventral branchial arch patterning in mice. Copyright 2004.