3268
The first allele suffers a mutational event - - deletion , duplication or point mutation ( manuscript in preparation ) - - either in the germ line ( all bilateral patients ) or in a somatic retinal cell ( most unilateral patients ) .
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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