exon - WordReference.com Dictionary of English

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exon

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Concise Oxford English Dictionary © 2008 Oxford University Press:
exon1 /ˈɛksən/

▶noun Biochemistry a segment of a DNA or RNA molecule containing information coding for a protein or peptide sequence. Compare with intron.

– origin 1970s: from expressed (see express1) + -on.

Concise Oxford English Dictionary © 2008 Oxford University Press:
exon2 /ˈɛksɒn/

▶noun Brit. each of the four officers acting as commanders of the Yeomen of the Guard.

– origin C18: representing the pronunc. of Fr. exempt ‘free from’ (because they were exempt from normal duties).

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