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EC-nummer.
EC-nummer (av engelsk: Enzyme Commission number) er en klassifiseringsmetode og nomenklatur for enzymer og de ulike reaksjonene de katalyserer. Hvert EC-nummer viser til en spesifikk enzymkatalysert reaksjon, og gir også anbefalt navngivning for det tilhørende enzymet.
Hver enzymkatalysert reaksjon har en betegnelse med fire siffergrupper, adskilt med punktum, for eksempel 1.1.1.1 (alkoholdehydrogenase). Det første tallet angir hvilken enzymklasse enzymet tilhører, deretter en gradvis finere klassifisering utover i de forskjellige tallene. Klassene er som følger:
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