. Stem cell research. Technician using a light microscope to carry out nuclear transfer on a mouse egg (at upper centre on the monitor). Its genetic material has been removed and an adult cell nucleus is being injected in its place with a needle. The resulting embryo will consist of embryonic stem cells, the cell precursors from which all the body's specialized cells develop. Stem cells made from the cell nucleus of a patient could be used for therapeutic cloning, the creation of personalized tissues to replace diseased or damaged body parts. Photographed at the Centre for Genome Research, Edinburgh University, Scotland. MODEL RELEASED

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