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converts phenylalanine residues into tyrosine residues. Hydroxylation at C-3 of tyrosine gives 3,4- dihydroxyphenylalanine (DOPA), which is a precursor to hormones and can be converted into dopamine.

Hydroxylation enzymes

* 17?-Hydroxylase
* Cholesterol 7 alpha-hydroxylase
* Dopamine ?-hydroxylase
* Phenylalanine hydroxylase

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