Table S7 Statistical comparison of tergite severity when different mutations are introduced. Tables shows p values from Fisher’s exact test comparing genotypes for the distribution between progeny with any phenotype (category 2, 3 and 4) and others, or between progeny with a strong phenotype (category 3 and 4) and others. In each case comparisons are made to the population expressing each repeat with da-GAL4 alone. (TIF) Acknowledgments The authors wish to thank Joanne Milverton for injection of constructs into Drosophila. We also thank the Bloomington Stock Center for providing References 1. Richards RI (2001) Dynamic mutations: a decade of unstable expanded repeats in human genetic disease. Hum Mol Genet 10: 2187–2194. 2. Wells RD, Ashizawa T (2006) Genetic instabilities and neurological diseases. Massachusetts: Academic Press. 783p. 3. La Spada AR, Taylor JP (2010) Repeat expansion disease: progress and puzzles in disease pathogenesis. Nat Rev Genet 11: 247–258. 4. 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