3601
While the majority of cases are of unknown etiology , accumulating evidence suggests that rare genetic mutations , such as 22q11 . 2 Deletion Syndrome ( 22qDS ) , can play a significant role in predisposition to the illness .
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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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