Light micrograph of a sheep egg having its nucleus (DNA) removed during cloning of "Dolly", the first sheep cloned from an adult cell. At centre is a sheep egg cell. At left a pipette holds the egg; at right a needle penetrates the egg to remove its DNA. The empty egg cell will then be injected with a sheep udder cell. A spark of electricity fuses these cells into one and stimulates an embryo to grow. The embryo is implanted into the womb of a surrogate sheep. Research conducted by Dr Wilmut at the Roslin Institute, Edinburgh, Scotland. G285/037, G285/039, G285/040, G285/041).
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