Lgr5 homologues associate with Wnt receptors and mediate R-spondin signalling. by de Lau, W, Barker, N, Low, T, Koo, B, Li, V, Teunissen, H, Kujala, P, Haegebarth, A, Peters, P, van de Wetering, M, Stange, D, van Es, J, Guardavaccaro, D, Schasfoort, R, Mohri, Y, Nishimori, K, Mohammed, S, Heck, A, Clevers, H