Five-prime cap
Specially altered nucleotide on the 5' end of pre-mRNA / From Wikipedia, the free encyclopedia
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In molecular biology, the five-prime cap (5′ cap) is a specially altered nucleotide on the 5′ end of some primary transcripts such as precursor messenger RNA. This process, known as mRNA capping, is highly regulated and vital in the creation of stable and mature messenger RNA able to undergo translation during protein synthesis. Mitochondrial mRNA[1] and chloroplastic mRNA[2] are not capped.