Fig5G. Copyright: Reprinted with permission from Elsevier from [doi:10.1006/dbio.2002.0814] Dev Biol 251: 395-408, Borchers AG; Hufton AL; Eldridge AG; Jackson PK; Harland RM; Baker JC, The E3 ubiquitin ligase GREUL1 anteriorizes ectoderm during Xenopus development. Copyright 2002