Fabrizio, P., Dannenberg, J., Dube, P., Kastner, B., Stark, H., Urlaub, H., et al. (2009). The evolutionarily conserved core design of the catalytic activation step of the yeast spliceosome. Molecular Cell, 36(4), 593-608. Retrieved from http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6WSR-4XSVMS8-8-2&_cdi=7053&_user=38661&_orig=search&_coverDate=11%2F25%2F2009&_sk=999639995&view=c&wchp=dGLbVlz-zSkWz&md5=c38480f8b34d8e676f3d92666a21e319&ie=/sdarticle.pdf.