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Scientists clone DNA (“molecular cloning”) so that they have large quantities of identical copies of DNA for scientific experiments.
“It’s a busy morning in the cloning laboratory of the big-city hospital. In nine months, the parents, who face the very likely prospect of losing the one daughter they have, could find themselves raising two of her–the second created expressively to keep the first alive” (Kluger p. This is just one of the many scenarios people are imagining after the successful cloning–manipulating a cell from an animal so that it grows into an exact duplicate of that animal–of the sheep, Dolly.
Neither the cells nor the blastocyst are ever implanted in a uterus, as is required for reproductive cloning and the birth of an animal.
Figures 1 and 2 in the Executive Summary illustrate the differences between the techniques of reproductive cloning and nuclear transplantation to produce stem cells.
Chapter 2 provides a basic introduction to cloning and its relation to stem cell research.
Chapter 3 is an overview of the state of the science of animal cloning and a summary of its possible application to humans.