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Twenty - eight percent of identified PAX6 mutations are C - T changes at CpG dinucleotides , 20 % are splicing errors , and more than 30 % are deletion or insertion events .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 None