Protein-tyrosine kinase (PTK) activity

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The action of an enzyme. There are many identified PTK enzymes. They are involved in signaling pathways and regulate important functions in the cell.
Benefit: A tyrosine kinase is an enzyme that is capable of transferring groups of phosphate from ATP to a protein in a cell.
Fact: Tyrosine kinases are a subgroup of the larger class of protein kinases that attach phosphate groups to other amino acids

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