This book reviews recent advances in pancreatic endocrine and exocrine tissue development, function and regeneration. It provides a comprehensive overview on different aspects of beta-cell biology, including heterogeneity of function and gene expression and function, epigenetics, RNA and protein expression contributions to beta-cell specification and cell-fate maintenance. Furthermore, it covers recent progress in differentiating functional islets in vivo, environmental impacts on beta-cell development and function, and communications between various islet endocrine cells and how they contribute to the regulation of blood glucose homeostasis. The book provides a comprehensive resource for understanding the various compartments of the pancreas and is aimed at pancreas, beta-cell biology, and diabetes researchers.