Fig 2F, Jung et al 1999 [PMID:10330496] .Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(98)00234-2] Mech Dev 81: 179-82, Jung HS; Oropeza V; Thesleff I, Shh, Bmp-2, Bmp-4 and Fgf-8 are associated with initiation and patterning of mouse tongue papillae. Copyright 1999