“…During the past decade, many promising research results indicate that stem cells, thought to be an important potential source of all types of clinically relevant cells, do bring the prospect to replace damaged tissue by the process of regeneration, ever closer to a clinical reality [THOMSON & AL., 1998;ORLIC & AL., 2001;BURD & AL., 2007]. Continuing research on stem cell has increased our understanding of some devastating human diseases like diabetes, cancer, Parkinson's disease and other neurodegenerative diseases [MARTINEZSERRANO & BJORKLUND, 1996;CAO & AL., 2002;DI GIORGIO & AL., 2007].…”