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Exons

Segments of a gene that code for a sequence of nucleotides in a specific mRNA.

The coding (and some UTR) portions of a eukaryotic gene retained in mature mRNA after splicing removes introns.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
The coding (and some UTR) portions of a eukaryotic gene retained in mature mRNA after splicing removes introns.

Introns, Transcription