In the cytoplasm it acts as a dehydratase in the regeneration of tetrahydrobiopterin , the cofactor for aromatic amino acid hydroxylases .
in the cytoplasm it acts as a dehydratase in the regeneration of tetrahydrobiopterin , the cofactor for aromatic amino acid hydroxylases .
O O O O O O O B-protein_family_or_group O O O O B-protein_molecule O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O