Authors: Hugo J Snippert; Laurens G van der Flier; Toshiro Sato; Johan H van Es; Maaike van den Born; Carla Kroon-Veenboer; Nick Barker; Allon M Klein; Jacco van Rheenen; Benjamin D Simons; Hans Clevers Journal: Cell Date: 2010-10-01 Impact factor: 41.582