489
All three affected children were homozygous and the parents heterozygous for a single novel mutation ( C301 - > T ) in exon 1 , replacing Pro7 of mature AVP with Leu ( Leu - AVP ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 None