Source:http://linkedlifedata.com/resource/umls/id/C0162771
MSH: Organelles in which the splicing and excision reactions that remove introns from precursor messenger RNA molecules occur. One component of a spliceosome is five small nuclear RNA molecules (U1, U2, U4, U5, U6) that, working in conjunction with proteins, help to fold pieces of RNA into the right shapes and later splice them into the message.,CSP: large ribonucleoprotein complex composed of snRNP and other components, which splices the introns of nuclear RNA transcripts into messenger RNA to be transported to the cytoplasm for translation.,GO: Any of a series of ribonucleoprotein complexes that contain RNA and small nuclear ribonucleoproteins (snRNPs), and are formed sequentially during the splicing of a messenger RNA primary transcript to excise an intron. [GOC:mah, ISBN:0198547684, PMID:19239890]