"Exteins" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.

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The (EXternal proTEIN) sequences flanking INTEINS, which are internal fragments of precursor proteins removed by PROTEIN SPLICING. Concomitantly, as the inteins are excised, the exteins are ligated to form mature proteins.

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