"So, what is an embryo?" A comparative study of the views of those asked to donate embryos for hESC research in the UK and Switzerland.

"Erica Haimes acknowledges the financial support of the Wellcome Trust, and the contributions of Jacquelyne Luce, Susan Dowdle, Ken Taylor, the clinical staff and the interviewees to the UK research. The Swiss team acknowledge the Swiss National Science Foundation, the Fondation Brocher, and Peter Bürkli, Franziska Genitsch, Gaia Barazzetti, the clinical staff, and their interviewees. The authors thank the three anonymous referees for their comments. 7.: The UK study was funded in advance of the Swiss study. Though its design helped to inform that of the Swiss study, the two projects were funded and conducted independently of each other. To emphasise the independence of the studies we have retained their distinctive voices and methods of anonymizing the interviewees."