Cleavage of the 5'-methylguanosine-cap of an mRNA. The methylguanosine-cap is present at the 5'-end of eukaryotic mRNAs. Decapping inactivates translation initiation and promotes 5'-to-3' decay of mRNA. [PMID:23287066]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process