QUOTE(Technopath @ Oct 8 2007, 08:53 PM)

That's what they've been telling us.
But considering the moral and ethic implications of cloning (which I don't really care about, since I'm a scientifically curious person and not really a religious person) they're probably doing it "underground" or I've watched too many episodes of "Surface", lol.
There is nothing morally or ethically wrong with cloning animals for research as far as science is concerned. The problem of successful cloning is real however. Its a very touch and go process, when a somatic nuclear envelope is placed in an egg, certain factors must be introduced to "trick" the egg into dividing. The failure rate at this point is immense.
Gamete cells also contain better proof reading mechanisms for DNA replication and repair. Obviously, this serves an important role; making sure your offspring are ok a the genetic level. Somatic cells lack the proof reading system of gamete cells (This is why you see cancer arise in the body, you don't see cancer occur in sperm cells however). Because of this "sloppy replication", there is a large likely hood the DNA will become too damaged during divisions and the cell will head down the lonely road of apoptosis. If this occurs too often in an embryos development, spontaneous abortion is sure to follow. Or the mothers body simply reabsorbs the embryo.
So not only do you have these problems, but it gets worse.
At the ends of your DNA are extensions known as telomeres. Throughout your life, many types of your bodies cells reproduce through mitosis. Every time they replicate, the telomeres at the end of the DNA shorten. When they get to a certain length, the cell recognizes this, and will not divide any further. Thus, the end of the line for that cell. As you age this occurs in more and more cells, making it harder for your body to run normal repair mechanisms (like if you were cut, when you are old it takes much longer to heal due to the fact less cells are capable of dividing to "fill" the cut). Eventually, loss of repair causes death (or worse, cancer).
So what does this have to do with cloning?
When you take a nuclear envelope from a somatic cell, it already has shortened telomeres. Lets say you wanted to clone an animal that lives for 5 years. You took your nuclear envelope from an animal that was 2.5 years old. After inserting this envelope into a 'empty' egg, the egg with the new nucleus would conclude that it was 2.5 years old already. So your clone is going to have a dramatically shortened life span, along with any hammy-down DNA errors occurred over the original nucleus' life span.