Fig4F. from [doi:10.1038/sj.embor.7400752] Andersson O; Reissmann E; Ibanez CF. 2006. EMBO Rep 7: 831-837. Growth differentiation factor 11 signals through the transforming growth factor-beta receptor ALK5 to regionalize the anterior-posterior axis. © Nature Publishing Group. Reproduced with permission from EMBO Rep.