Chen S, Bubeck D, MacDonald B, Liang W, Mao J, Malinauskas T, Llorca O, Aricescu A , Siebold C, He X, Jones E . Structural and Functional Studies of LRP6 Ectodomain Reveal a Platform for Wnt Signaling. Developmental Cell. 2011 Nov;21(5):848–61. doi: 10.1016/j.devcel.2011.09.007.