Exons of the mRNA are removed during RNA processing, which makes it easier for the ribosome to connect to the 5' end.
In some genes, non-coding DNA sequences are found between the DNA segments that code for proteins. Pre-introns mRNA's are cut out during RNA splicing to provide the complete set of instructions for the protein.
The removal of specific sequences known as intervening sequences, or introns, or they're "splicing out" is one of the processes in this processing, known as RNA splicing. Thus, the remaining sequences, known as exons, are joined through splicing to form the final mRNA.
The complete gene, including exons and introns, is transcribed into a pre-mRNA during transcription. Introns are cut out and exons are combined to create a continuous coding region during the RNA splicing process.
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