Figure 2N. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(02)00018-7] Mech Dev 113: 163-8, Lin W; Furthauer M; Thisse B; Thisse C; Jing N; Ang SL, Cloning of the mouse Sef gene and comparative analysis of its expression with Fgf8 and Spry2 during embryogenesis. Copyright 2002