Circulating Endothelial Progenitor Cells: Relevant in Physiopathology, A Promise for Clinical applications, Turning Embryonic and Fetal Stem Cells into red cells : Erythropoiesis as a Model for the challenges of Tissue Engineering, Endothelial Progenitor Cells Potential for Vasculogenesis and Cardiomyogenesis, Primate Liver Progenitor Cells, Tracing Clonal Lineages of Stem Cells in vivo, Agent-Dependent Effects of parp-a Deficiency on DNA Damage Responses and Genomic Stability in Mouse ES Cells, Tissue Engineering Using Adipose-Derived Stem Cells Harvested from GFP Transgenic Animals, Prostate Stem Cells