TY - JOUR AU - Barker, N; van Es, J H; Kuipers, J TI - Identification of stem cells in small intestine and colon by marker gene Lgr5 JO - Nature IS - 7165 VL - 449 PY - 2007 DO - 10.1038/nature06196 SP - 1003 EP - 1007 N1 - , et al. ER -