Fig4A.Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(01)00338-0] Mech Dev 103: 27-33, Ikeya M; Takada S, Wnt-3a is required for somite specification along the anteroposterior axis of the mouse embryo and for regulation of cdx-1 expression. Copyright 2001.