Scientists Genetically Engineer Mice With Super Endurance

Scientists Genetically Engineer Mice With Super Endurance: "How do you build a mouse that can run six-times farther than its average bretheren? Take away all its fast-twitch muscle fiber, along with its ability to contract its muscles.

According to ScienceNow, researchers at the University of Pennsylvania found the gene receptor that controls the protein responsible for muscle contraction. When they engineered mice to lack that protein, all the muscle in their body converted any fast twitch muscle (which is more powerful, but fatigues quicker) to slow twitch muscle fiber, which provided endurance gains."