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Tissue homeostasis requires the production of newly differentiated cells from resident adult stem cells. Central to this process is the expansion of undifferentiated intermediates known as transit-amplifying (TA) cells, but how stem cells are triggered to enter this proliferative TA state remains an important open question. Using the continuously growing mouse incisor as a model of stem cell-based...
Two recent studies continue the debate regarding lineage and hierarchy in the intestinal epithelium. One reports that quiescent crypt cells are Paneth cell precursors (Buczacki et al., 2013). The second shows that tamoxifen induces apoptosis in crypt cells and that suppressing apoptosis alters lineage tracing patterns (Zhu et al., 2013).
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