+**Protein Kinase**
+Protein kinases are vital enzymes that add a [Phosphate Group](/wiki/phosphate_group) to specific [Proteins](/wiki/protein). This crucial process, known as [Phosphorylation](/wiki/phosphorylation), acts as a molecular switch, orchestrating nearly all cellular functions from growth to immune response.
+## See also
+- [ATP](/wiki/atp)
+- [Cell Signaling](/wiki/cell_signaling)
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