In this book, the authors present current research in the study of the biology, characterization and potential clinical application of progenitor cells. Topics discussed include endothelial progenitor cells and cardiovascular disease; isolation, expansion and clinical therapy of human corneal epithelial stem/progenitor cells; genetically engineered blood pharming; regulation of neural progenitor cells by Wnt5a-signaling in the developmental central nervous system; endothelial progenitor cells in a clinical setting; role of microRNAs in endothelial progenitor cells and their implication for cardiac repair; and cellular origins in amphibian regeneration.