Growth and regeneration of adult beta cells does not involve specialized progenitors.

By M. Teta, Matthew M. Rankin, Simon Y. Long, Geneva M. Stein, J. Kushner. Developmental Cell, 2007

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Neuregulin1/ErbB4 signaling induces cardiomyocyte proliferation and repair of heart injury. (2009, methodology): “For continuous labeling, one injection of thymidine analog was given followed by addition to the drinking water (1 mg/ml) for 9 days (Teta et al., 2007).”
β Cells Can Be Generated from Endogenous Progenitors in Injured Adult Mouse Pancreas (2008, background): “The elusiveness of this cell type reached a summit whengenetic lineage tracingprovided evidence thatpre-existing b cells, rather than stem/progenitor cells, are the major source of new b cells in adult mice both under normal physiological conditions and after 70% or 50% pancreatectomy (Dor et al., 2”
Pancreas organogenesis: From bud to plexus to gland (2011, background): “Acinar cells and endocrine cells go through a maturation process lasting into postnatal life, and there is significant postnatal expansion of endocrine cell numbers, likely linked to self-replication (Desai et al., 2007; Finegood et al., 1995; Teta et al., 2007).”
Beta Cell Dysfunction and Insulin Resistance (2013, background): “…diabetogenic injury, new beta cells are derived mainly by replication of preexisting beta cells (Dor et al., 2004; Georgia and Bhushan, 2004; Frontiers in Endocrinology | Diabetes March 2013 | Volume 4 | Article 37 | 4 Brennand et al., 2007; Nir et al., 2007; Teta et al., 2007; Meier et al., 2008).”