Xu, Z., Poidevin, M., Li, X., Li, Y., Shu, L., Nelson, D.L., Li, H., Gearing, M., Wingo, T.S., and Jin, P. (2013) Expanded Hexanucleotide GGGGCC Repeat RNA Associated with ALS/FTD Causes Neurodegeneration. Proceedings of the National Academy of Sciences, 110: 7778-7783. PMC3651485