<P> In humans , this enzyme is expressed both in the liver and the kidney , and there is some indication that it may be differentially regulated in these tissues . PAH is unusual among the aromatic amino acid hydroxylases for its involvement in catabolism ; tyrosine and tryptophan hydroxylases , on the other hand , are primarily expressed in the central nervous system and catalyze rate - limiting steps in neurotransmitter / hormone biosynthesis . </P>
<P> In humans , this enzyme is expressed both in the liver and the kidney , and there is some indication that it may be differentially regulated in these tissues . PAH is unusual among the aromatic amino acid hydroxylases for its involvement in catabolism ; tyrosine and tryptophan hydroxylases , on the other hand , are primarily expressed in the central nervous system and catalyze rate - limiting steps in neurotransmitter / hormone biosynthesis . </P>
where is phenylalanine hydroxylase found in the body
where is phenylalanine hydroxylase found in the body
In humans , this enzyme is expressed both in the liver and the kidney
In humans , this enzyme is expressed both in the liver and the kidney