sentences:  These mice are called YG22R (one GAA sequence of 190 repeats) and YG22R (two GAA sequences of 90 and 190 repeats).These mice show symptoms similar to human patients.An overexpression of frataxin in "Drosophila" has shown an increase in antioxidant capability, resistance to oxidative stress insults and longevity, supporting the theory that the role of frataxin is to protect the mitochondria from oxidative stress and the ensuing cellular damage.