+**Phosphorylation** is the addition of a [phosphate group](/wiki/Phosphate_Group) to an organic molecule, primarily a protein. This subtle molecular modification acts as a crucial switch, regulating nearly all cellular processes, from [protein function](/wiki/Protein_Function) to signal transduction and energy transfer within living organisms.
+## See also
+- [Dephosphorylation](/wiki/Dephosphorylation)
+- [Kinase](/wiki/Kinase)
+- [ATP](/wiki/ATP)
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