Fig5A. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2003.08.011] Dev Biol 264: 91-105, Laurikkala J; Kassai Y; Pakkasjarvi L; Thesleff I; Itoh N. Identification of a secreted BMP antagonist, ectodin, integrating BMP, FGF, and SHH signals from the tooth enamel knot. Copyright 2003 [PMID:14623234]