Fast-moving and ever-changing, stem cell science and research presents ongoing ethical and legal challenges in the UK as well as in many other countries. Each development and innovation throws up new ethical challenges. This is the case even where a new development, for example, induced pluripotent stem cells, initially seems to solve old dilemmas. Sometimes it becomes evident that new science does not in fact solve old problems and the ethical issues remain. In recognition of this, this book tackles these issues, old and new. The early chapters bring fresh new perspectives on the permissibility of using embryos in stem cell research, while the later chapters move on to actual and potential new clinical uses of stem cells and present novel arguments about this. The value of this approach is that readers can gain an understanding of the different issues in the stem cell debate from a number of ethical (and legal) perspectives, but in a manner which gives deep and rigorous analysis.