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Factor required for mammalian spliceosome assembly is localized to discrete regions in the nucleus.
Fu, X-D., R. Katz, A. M. Skalka, and T. Maniatis. Spector, D., X-D., Fu, and T. Maniatis. Fu, X-D. and T. Maniatis. The mammalian splicing factor SC35 mediates specific interactions between U1 and U2 snRNPs at the 3' splice site. Fu, X-D. and T. Maniatis.