TY - JOUR AU - Sato, T; van Es, J H; Snippert, H J TI - Paneth cells constitute the niche for Lgr5 stem cells in intestinal crypts JO - Nature IS - 7330 VL - 469 PY - 2011 DO - 10.1038/nature09637 SP - 415 EP - 418 N1 - , et al. ER -