
Native Spliceosomes Assemble with Pre-mRNA to Form Supraspliceosomes
Keywords: supraspliceosome; RNA polymerase II; eukaryotic pre-mRNA; ribonucleoproteinRNP, ribonucleoprotein; snRNA, small nuclear RNA; EM, electron microscopy; MN, micrococcal nuclease; NE, nuclear extract; 5′SS, 5′ splice site; STEM, scanning transmission electron