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Two words, Therapeutic Cloning. From the center for Bioethics and Human Dignity(http://cbhd.org/stem-cell-research/overview):

6. What is the relationship between embryonic stem cell research and "therapeutic" cloning?

Another potential obstacle encountered by researchers engaging in embryonic stem cell research is the possibility that embryonic stem cells would not be immunologically compatible with patients and would therefore be “rejected,” much like a non-compatible kidney would be rejected. A proposed solution to this problem is to create an embryonic clone of a patient and subsequently destroy the clone in order to harvest his or her stem cells. Cloning for this purpose has been termed “therapeutic” cloning—despite the fact that the subject of the research—the clone—is not healed but killed.