Despite the therapeutic potential of human embryonic stem (HES) cells, many people believe that HES cell research should be banned. The reason is that the present method of extracting HES cells involves the destruction of the embryo, which for many is the beginning of a person. This paper examines a number of compromise solutions such as parthenogenesis, the use of defective embryos, genetically creating a "pseudo embryo" that can never form a placenta, and determining embryo death, and argues that none (...) of these proposals are likely to satisfy embryoists, that is, those who regard the embryo as a person. This paper then proposes a method of extracting HES cells, what might be called the Blastocyst Transfer Method, that meets the ethical requirements of embryoists, and it considers some possible concerns regarding this method. It concludes by encouraging future HES cell research to investigate this method. (shrink)

The philosophical literature would have us believe that the conservative view on abortion is based on the claim that the fetus is a person from the time of conception. Given the widespread acceptance of this analysis, it comes as something of a surprise to learn that it conflicts with a number of major arguments offered in support of the conservative view. I argue, in the present paper, that a careful examination of these inconsistencies establishes that the personhood analysis is mistaken: (...) the conservative view is based on the natural process of fetal development, not the personhood of the fetus. (shrink)

The development of the human embryo from the time of fertilization through the eighth post-fertilization week is described for medical policy purposes. During pre-implantation stages, differentiation occurs between precursors of embryonic and extra-embryonic structures. During implantation formation of a fore-hind axis begins within the inner cell mass. By the end of the eighth week, head, face, hands, and feet are suggestive as to species-recognition but not yet definitive. Data from laboratory studies of non-human mammalian embryos elucidate important aspects of human (...) embryonic development. Keywords: embryos, development, differentiation, genome CiteULike Connotea Del.icio.us What's this? (shrink)