859
We present a child in whom phenylketonuria was apparently caused by homozygosity for the mutation E390G in exon 11 of the phenylalanine hydroxylase ( PAH ) gene .
 phenylketonuria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 phenylketonuria