Figure 1C. Copyright: This image is from [doi:10.1002/(SICI)1097-0177(199812)213:4<440::AID-AJA9>3.0.CO;2-6] Lescher B; Haenig B; Kispert A, "sFRP-2 is a target of the Wnt-4 signaling pathway in the developing metanephric kidney." Dev Dyn 1998 Dec;213(4):440-51. Reprinted with permission of Wiley-Liss Inc. [PMID:9853965]