Source:http://linkedlifedata.com/resource/umls/id/C1158728
GO: Any process involved in the conversion of one or more primary RNA transcripts into one or more mature RNA molecules. [GOC:mah],NCI: Modifications of primary RNA transcripts including: splicing, cleavage, base modification, capping and the addition of poly A (mRNA) or CCA (tRNA) tails. The primary transcript is the RNA molecule containing the exact sequence of bases (with U substituting for T in DNA) found in the nontemplate strand of transcribed DNA.