<prompt> What is the macromolecular complex that associates with introns during mRNA splicing?SplicerDicerNuclear bodySpliceosome  <response>: A special multicomponent complex, the spliceosome, is involved in conveing the primary transcript into mRNA. Spliceosomes consist of the primary transcript, five snRNAs U1, U2, U4, U5, and U6 and more than 60 proteins, many of which contain conserved RNP and SR protein motifs. Ref: Weil P. 2011. Chapter 36. RNA Synthesis, Processing, Modification. In D.A. Bender, K.M. Botham, P.A. Weil, P.J. Kennelly, R.K. Murray, V.W. Rodwell Eds,Harpers Illustrated Biochemistry, 29e. 