However, some experts are concerned about the striking similarities between stem cells and cancer cells. Multilineage differentiation from human embryonic stem cell lines.
However, reproductive human or animal cloning is not defined by the method used to derive the genetically identical embryos suitable for implantation. In the future, some exceptions may be authorized to permit cloning for specifically defined therapeutic purposes pursuant to freely given informed consent by the mother or by the couple which opts for cloning as a method of treating sterility or preventing serious genetic disease while, for example, eliminating the need of an extramarital gamete donor.
For example, brain cells modified by the genes responsible for the production of dihydroxyphenylalanine L-Dopa and dopamine could be obtained for transplantation into the brains of Parkinson's patients.
They then transfer the DNA of the donor animal's somatic cell into an egg cell, or oocyte, that has had its own DNA-containing nucleus removed. Depriving humanity of a penetrating knowledge of all potentialities of the living would be counterproductive. Other examples are potato and banana.
Use of cytokines and other specific factors could produce various tissues such as blood vessels.
As the aforementioned procedures are of particularly low efficiency, there is a need to identify the cells that have been successfully transfected with the vector construct containing the desired insertion sequence in the required orientation.
It would be possible, by using ES cells prepared with nuclear transplantation from patients and healthy people, to compare the development of such cells and to study the fundamental processes that modulate predilections to diseases.
Some people also have expressed interest in having their deceased pets cloned in the hope of getting a similar animal to replace the dead one.
Despite several highly publicized claims, human cloning still appears to be fiction. Ethical Aspects Although their motives are understandable, this is a relatively arbitrary choice; in no sense is it a therapeutic procedure.