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Phenylketonuria ( PKU ) is an autosomal recessive disorder of amino acid metabolism caused by a deficiency of the hepatic enzyme phenylalanine hydroxylase ( PAH ; phenylalanine 4 - monooxygenase , EC 1 . 14 . 16 . 1 ) .
 Phenylketonuria, PKU, autosomal recessive disorder, deficiency of the hepatic enzyme phenylalanine hydroxylase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Phenylketonuria, PKU, autosomal recessive disorder, deficiency of the hepatic enzyme phenylalanine hydroxylase