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In most eukaryotic genes, coding regions (exons) are interrupted by noncoding regions (introns).

Exon - RNA sequences in the primary transcript that are found in the mRNA.

Intron - RNA sequences between exons that are removed by splicing.

During transcription, the entire gene is copied into a pre-mRNA, which includes exons and introns. During the process of RNA splicing, introns are removed and exons joined to form a contiguous coding sequence.