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A genetically modified "supermouse" which can run twice as far as a normal rodent has been created by scientists working in the US.
It also lives longer, and breeds later in life compared with its standard laboratory cousin.
"The muscles of these mice have many more mitochondria. These are the little 'engines' in the cell that produce energy. For some reason, the number of mitochondria are around 10 times more than we see in the muscle of their littermates."