12706
The development of alloantibodies , or inhibitors , is a serious complication of congenital hemophilia that may impair the effectiveness of fVIII and fIX , leading to increased morbidity and cost of therapy .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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