The sequence of enzymatic reactions by which the 5' cap structure, an inverted 7-methylguanosine linked via a 5'-5' triphosphate bridge (m7G(5')ppp(5')X) to the first transcribed residue, is added to a nascent transcript. [GOC:vw, PMID:9266685]
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Collection
C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process