The subject of this book is stem cell research and regenerative medicine. Stem cells are undifferentiated cells that have the ability to differentiate into different lineages of the body. Stem cells carry tremendous potential for the treatment of a broad range of disease and injuries. Stem cells exist in embryonic, foetal, and adult tissues, including the adult central nervous system. This book aims at, in depth, the recent developments in stem cell research and regenerative medicine. Though this book encompasses all the fields of stem cell research and regenerative medicine, it emphasises embryonic and adult stem cells.