They were created by a team of American scientists led by Richard Hanson, professor of biochemistry at Case Western Reserve University at Cleveland, Ohio, to gain a greater understanding of the PEPCK-C enzyme, which is present mainly in the liver and kidneys.
Professor Hanson noted that the supermice "are metabolically similar to Lance Armstrong biking up the Pyrenees. They utilize mainly fatty acids for energy and produce very little lactic acid. They are not eating or drinking and yet they can run for four or five hours. They are 10 times more active than ordinary mice in their home cage. They also live longer – up to three years of age – and are reproductively active for almost three years. In short, they are remarkable animals." However, "they eat twice as much as control mice, but they are half the weight, and are very aggressive. Why this is the case, we are not really sure."
- Connor, Steve (2007-11-02). "The mouse that shook the world". The Independent.
- Highfield, Roger (2007-11-02). "Genetically engineered 'mighty mouse' is the rodent Lance Armstrong". Telegraph.