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known as precursor messenger RNA, mature mRNA consists exclusively of exons and has all introns removed.Mature mRNA is also called "mature transcript", "mature RNA" or "mRNA".

The production of a mature mRNA molecule occurs in 3 steps:

# Capping of the 5' end
# Polyadenylation of the 3' end
# RNA Splicing of the introns

Capping the 5' End

During capping,

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