Figure 4A of Belo et al., 1998 [PMID:9533949] . Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(97)00204-9] Mech Dev 1998 Mar;72(1-2):15-25, Belo JA; Leyns L; Yamada G; De Robertis EM, The prechordal midline of the chondrocranium is defective in Goosecoid-1 mouse mutants. Copyright 1998.