Classic Phenylketonuria, also known as classical phenylketonuria, is related to hyperphenylalaninemia, bh4-deficient, a and phenylketonuria, and has symptoms including dry skin An important gene associated with Classic Phenylketonuria is PAH (Phenylalanine Hydroxylase), and among its related pathways/superpathways are Metabolism and tyrosine degradation. The drugs D-Phenylalanine and Vitamins have been mentioned in the context of this disorder. Affiliated tissues include skin and brain, and related phenotypes are global developmental delay and intellectual disability, severe