In this timely collection, some of the world's leading ethicists grapple with the variety of issues posed by human embryonic stem cell research. * Investigates the moral status of the embryo including the creation of chimeras and paying for gametes (eggs and sperm) and embryos for research purposes * Provides a thorough evaluation of the ethics and politics of regulating hESC research, and the privacy, confidentiality, and informed consent in the conduct of research and clinical investigations * Essential reading for scientists, philosophers, policy makers, and all who are interested in the ethical conduct of science * Contributors include David DeGrazia, Lori Gruen, Elizabeth Harman, John Harris, Jeff McMahan, Don Marquis and Peter Singer