Why the fuss about stem cells?
Stem cells are those cells which are undifferentiated and have the potential to develop into any other type of cell. They are currently obtainable from four sources. Embryonic stem cells can be obtained from surplus foetuses left over after in vitro fertilisation. These cells are otherwise destroyed.
Second, there are egg donations, consciously made by people willing to support the research. Third is somatic cell nuclear transfer. This is where genetic material is inserted into an egg cell without any fertilisation taking place and it raises the spectre of cloning. Lastly, we have aborted foetuses.
Some people are quite squeamish about the idea of human cells being used in laboratory study but medical science has always done this. Until now, mostly dead human tissue has been used but the techniques enabling live human tissue to be used, and in particular undifferentiated stem cells, means that for the first time we are dealing with tissue that in some circumstances could develop into a human.
There is a huge cultural and ethical significance afforded to life, especially human life and this research evokes strong reactions from excited enthusiasm right through to abhorrence. And it matters. On the one hand we have the potential to cure a wide range of debilitating illnesses, to extend our understanding of human medicine in a way never before possible. On the other, we are learning how to create life from primitive building blocks opening the possibility of human cloning, genetic manipulation, transgenics and the like.
Much of the debate is couched in the terms of rights. A right is a power or liberty to which one is entitled or a thing to which one has a just claim. It is extremely difficult to apply this concept to cells which can neither act nor demand the expression of a right. Arguably the notion of cells having rights is a nonsense. But not so if those cells are defined as a person.
In modern society, the person is a legal entity with rights enshrined in law. It is this identification of stem cells with persons (albeit potential persons) that creates much of the ethical confusion. Once we concede that a stem cell has the same legal status as a person, the question of rights must be addressed.
And if the technology exists to take two elements which cannot survive and combine them to generate a cell which can survive and develop, does that imply we have created a legal entity called a person? For example, with somatic cell nuclear transfer – neither part can survive yet the combination can. Whatever a person is, it has to come into existence at some point and yet if it cannot show sentience, it cannot express what is necessary for rights to be claimed.
And there’s another difficulty because if we attach rights only to those able or willing to claim them, what happens to those persons who are unable to communicate? Those in a persistent vegetative state are of course, granted rights which we all feel they are entitled to, though they would fail any criteria based on communication. In law, those rights are exercised by proxy, someone else has to take the decisions.
So for stem cells to be treated as persons, the assumed rights have to be represented by a proxy. This is what religious zealots gravitate towards in claims about the rights of the unborn – they demand the right to represent the potential rights that may be afforded a group of cells if at some stage, they might become people. But it is ethical nonsense. In the same way as the right to free speech means nothing to someone in a persistent vegetative state, there are no rights associated with stem cells or foetuses. Rights do not exist in the abstract but are embedded in social practice.
For religious people, keen to defend the notion of souls, they have to resist scientific progress in understanding the origins of life because for them this process has to remain mystical. Understand how life comes about, evolves, mutates, develops, and you take apart the notions of souls, miracles, and supernatural beings. For rational people, an understanding of ethics helps us get our social priorities right.
There's an excellent site discussing these issues at
this site.

