JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Stem cell research. Nuclear transfer being carried out on a mouse egg in a petri dish under a microscope. The genetic material of the egg, which is held in place by a pipette (centre right), has been removed, and an adult cell nucleus is being injected in its place with a needle (lower left). 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.
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