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Phenylketonuria ( PKU ) is caused by a genetic deficiency of the enzyme phenylalanine hydroxylase ( PAH ) .
 Phenylketonuria, PKU, deficiency of the 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, deficiency of the enzyme phenylalanine hydroxylase