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Kinase

An enzyme that acts to add a phosphate group to a protein. This usually causes the protein to become active, although in some cases it can cause an active protein to become inactive. They are therefore crucial to cell functioning. Kinases are named after the particular amino acid to which the phosphate is added, so for example, a tyrosine kinase adds phosphate to a tyrosine, a serine kinase adds phosphate to serine etc.

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