Figure 1A(top left) from [doi:10.1101/gad.1230704] Genes Dev 18(19):2404-17. Guo X; Day TF; Jiang X; Garrett-Beal L; Topol L; Yang Y. Wnt/beta-catenin signaling is sufficient and necessary for synovial joint formation. Copyright 2004. [PMID:15371327]