Pre-mRNA splicing.

  • Small nuclear RNAs (snRNAs) form a complex called a spliceosome with small nuclear ribonucleoproteins (snRNPs) and other proteins.
  • The snRNAs bind to specific nucleotides in the introns of a pre-mRNA.
  • The RNA transcript is cut, releasing the introns and splicing the exons together, producing mature mRNA.