Cap

Cap
(Science: abbreviation) catabolite (gene) activator protein.
1. Any anatomical structure that resembles a cap or cover.
2. A protective covering for an incomplete tooth.
3. Colloquialism for restoration of the coronal part of a natural tooth by means of an artificial crown.
4. The nucleotide structure found at the 5′ terminus of many eukaryotic messenger rnas, consisting of a 7-methylguanosine connected, via its 5′-hydroxyl group, by a triphosphate group to the 5′-hydroxyl group of the first nucleoside encoded by the DNA; usually symbolised as m7G5’ppp5’N, where N is nucleoside number 1 in the transcribed mrna and is often itself methylated; the cap is added posttranscriptionally.


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