Dll1+ secretory progenitor cells revert to stem cells upon crypt damageFunctional Repair of CFTR by CRISPR/Cas9 in Intestinal Stem Cell Organoids of Cystic Fibrosis PatientsGeneration of BAC Transgenic Epithelial OrganoidsIn vitro expansion of single Lgr5+ liver stem cells induced by Wnt-driven regeneration