From the American Association for the Advancement of Science
and
Institute for Civil Society.
There are segments of American society that disagree on moral grounds with using public
monies to support certain types of stem cell research. However, public policy in a
pluralistic society cannot resolve all the differences that arise in national debates on
sensitive social issues. In the context of stem cell research, this leads to three practical conclusions. One is a willingness to permit individuals, whether they are researchers or embryo or fetal tissue donors, to act in conformity with their own moral views on these matters. A second is the commitment to public involvement in research support when this research is related to the promotion and protection of public health, including the acquisition of new molecular and cellular insights into basic human developmental biology. A third is respect for opposing views, especially those based on religious grounds, to the extent that this is consistent with the protection and promotion of public health and safety.
There are three primary sources of stem cells, each with different characteristics as to how many different developmental paths they can follow and how much they can
contribute to our understanding of a functioning organism. Embryonic stem cells (ES cells), derived from a very early embryo, and embryonic germ cells (EG cells), collected from fetal tissue at a somewhat later stage of development, have particular promise for a wide range of therapeutic applications because, according to our present knowledge, they are capable of giving rise to virtually any cell type. Research on these primordial cells
will also provide a unique opportunity to study human cell biology. Adult stem cells, obtained from mature tissues, differentiate into a narrower range of cell types. As a result, many cells of medical interest cannot currently be obtained from adult-derived stem cells. It is also less feasible to develop large-scale cultures from adult stem cells. However, it is important to note that, at this time, it is only adult human stem cells that are well-enough understood that they can be reliably differentiated into specific tissue types, and that have proceeded to clinical trials.
--------------------------------------------
1.Embryonic stem cells
2.Embryonic germ cells
3.Adult stem cells
Out of these three I'm willing to go along with 1 and 3.