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Ribbon diagram of an enzyme called TIM

An enzyme is a protein molecule in cells which works as a biological catalyst. Enzymes speed up chemical reactions in the body, but do not get used up in the process, so they can be used over and over again.

Almost all biochemical reactions in living things need enzymes. With an enzyme, chemical reactions go much faster than they would without the enzyme.p39 Other biocatalysts are catalytic RNA molecules, called ribozymes.

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