Figure 2C. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/j.ydbio.2006.08.018] Dev Biol 301: 218-26, Aoki M; Mieda M; Ikeda T; Hamada Y; Nakamura H; Okamoto H, "R-spondin3 is required for mouse placental development." Copyright 2007 [PMID:16963017]