While the principal source of the controversy surrounding HESCresearch lies in competing views about the value of human embryoniclife, the scope of ethical issues in HESC research is broader than thequestion of the ethics of destroying human embryos. It alsoencompasses questions about, among other things, whether researcherswho use but do not derive HESCs are complicit in the destruction ofembryos, whether there is a moral distinction between creating embryosfor research purposes and creating them for reproductive ends, thepermissibility of cloning human embryos to harvest HESCs, and theethics of creating human/non-human chimeras. This entry provides anoverview of all but the last two issues just listed; cloning andhuman-non-human chimeras are addressed in separate entries.


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