TYMP and mitochondrial neurogastrointestinal encephalomyopathy: Torres‐Torronteras et al (2011) successfully restored normal nucleoside pools in plasma, small intestine, skeletal muscle, brain, and liver of Tymp−/− mice, a model of MNGIE (mitochondrial neurogastrointestinal encephalopathy) disease, using lentiviral particles carrying a wild‐type form of thymidine phosphorylase.