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Keywords:

  • abortion;
  • future-of-value objection;
  • embryo;
  • human embryonic stem cell research;
  • moral-principle argument;
  • moral status;
  • twinning;
  • zygote

Abstract: Opponents of human embryonic stem cell (hESC) research claim that such research is incompatible with the moral principle that it is always wrong intentionally to end a human life. In this essay, I discuss how that principle might be revised so that it is subject to as few difficulties as possible. I then argue that even the most defensible version of the principle is compatible with the moral permissibility of hESC research.