RNA 5'-end processing RNA capping https://github.com/geneontology/go-ontology/issues/26930 2012-06-15T02:10:23Z biological_process bf GO:0036260 The sequence of enzymatic reactions by which a cap structure is added to the 5' end of nascent RNA polymerase transcripts. Examples of RNA capping include 7-methyl-G caps found on all RNA polymerase II transcripts and nucleotide-containing cofactor caps, such as NAD(H) or FAD, found on bacterial trancripts.