The Lgr5 intestinal stem cell signature: robust expression of proposed quiescent '+4' cell markers. Autor Muñoz, J, Stange, D, Schepers, A, van de Wetering, M, Koo, B, Itzkovitz, S, Volckmann, R, Kung, K, Koster, J, Radulescu, S, Myant, K, Versteeg, R, Sansom, O, van Es, J, Barker, N, van Oudenaarden, A, Mohammed, S, Heck, A, Clevers, H