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Genomic feature

Exon

Exon

A gene segment retained in a mature RNA after processing; an exon may contain coding sequence, untranslated sequence, or both.

Overview

EXPLORE BY LEVEL

An exon is a part of a gene that remains in the finished RNA message after splicing. Some exon pieces encode part of a protein; other exon pieces help regulate or support the RNA but are not translated.

Quick Facts

AT A GLANCE
Key ideaUsually retained in mature RNA

Follow the Connections

See how Exon links to other biological records.

Open network
ProcessRNA Processingretained after
All 1 Structured Connections
Exon · Genomic featureRETAINED AFTER →RNA Processing · Process

Recommended Reading

Trusted references for learning more about Exon.

guideExonNational Human Genome Research Institute textbookFrom DNA to RNAMolecular Biology of the Cell · NCBI Bookshelf
Research Claims

Alternative splice-site choice can include or skip exons, producing distinct transcript isoforms. Exon boundaries are transcript-specific and do not by themselves define a single protein product.